Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Loss) (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 2,091,808 $ 1,979,794
Ending balance 1,885,378 2,091,808
Foreign currency translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (28,128) (23,174)
Other comprehensive income (loss) before reclassifications 22,724 (4,954)
Reclassification adjustments for losses included in net loss, net of tax 0 0
Net other comprehensive income (loss) 22,724 (4,954)
Ending balance (5,404) (28,128)
Unrealized gain (loss) in Accumulated OCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 1,119 637
Other comprehensive income (loss) before reclassifications 3,790 (3,811)
Reclassification adjustments for losses included in net loss, net of tax (33) 4,293
Net other comprehensive income (loss) 3,757 482
Ending balance 4,876 1,119
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (27,009) (22,537)
Other comprehensive income (loss) before reclassifications 26,514 (8,765)
Reclassification adjustments for losses included in net loss, net of tax (33) 4,293
Net other comprehensive income (loss) 26,481 (4,472)
Ending balance $ (528) $ (27,009)