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Derivative Contracts (Details 2) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
|
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
|
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
|
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
|
Jun. 30, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
0 to 30 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
0 to 30 [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
31 to 60 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
31 to 60 [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
61 to 90 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
61 to 90 [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
91 to 120 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
91 to 120 [Member]
|
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
121 to 180 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
121 to 180 [Member]
|
Dec. 31, 2013
Not Designated as Hedging Instrument [Member]
Forward Contracts [Member]
More than 180 [Member]
|
Jun. 30, 2014
Notes Due February 1, 2033
2033 Senior Notes
|
Dec. 31, 2013
Notes Due February 1, 2033
2033 Senior Notes
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Jan. 31, 2013
Notes Due February 1, 2033
2033 Senior Notes
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| Derivative [Line Items] | |||||||||||||||||||||||
| Interest rate of notes payable | 3.00% | 3.00% | 3.00% | ||||||||||||||||||||
| Contract value | $ 3,679 | $ 3,679 | $ 1,537 | $ 1,157 | $ 472 | $ 966 | $ 562 | $ 623 | $ 503 | $ 831 | $ 0 | $ 102 | $ 0 | $ 0 | |||||||||
| Fair value | 3,624 | 3,624 | 1,585 | 1,146 | 489 | 951 | 579 | 612 | 517 | 815 | 0 | 100 | 0 | ||||||||||
| Derivative, Gain (Loss) on Derivative, Net | $ 10,967 | $ 12,651 | $ 452 | $ (10,898) | $ (55) | $ 154 | $ (55) | $ 133 | $ 49 | $ (11) | $ 17 | $ (15) | $ 18 | $ (11) | $ 14 | $ (16) | $ 0 | $ (2) | $ 0 | $ 0 | |||
| Contract days until maturity, lower range | 0 days | 0 days | 31 days | 31 days | 61 days | 61 days | 91 days | 91 days | 121 days | 121 days | |||||||||||||
| Contract days until maturity, higher range | 30 days | 30 days | 60 days | 60 days | 90 days | 90 days | 120 days | 120 days | 180 days | 180 days | 180 days | ||||||||||||