Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

v3.3.0.814
Subsequent Events (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 05, 2015
USD ($)
Oct. 01, 2015
d
conversion_right
$ / shares
Aug. 30, 2013
conversion_right
Jan. 31, 2013
$ / shares
Jan. 31, 2013
$ / shares
Jun. 30, 2015
conversion_right
Mar. 31, 2015
d
$ / shares
Sep. 30, 2015
USD ($)
$ / shares
Debt Instrument [Line Items]                
Credit line capacity               $ 134,961,000
Convertible Notes | Notes Due February 1, 2033                
Debt Instrument [Line Items]                
Common stock trigger price | $ / shares             $ 9.19  
Convertible debt, threshold percentage of stock price trigger         130.00%   130.00%  
Conversion Price | $ / shares       $ 7.07 $ 7.07   $ 7.07 $ 7.07
Number of trading days | d             20  
Number of consecutive trading days applicable conversion price             30 days  
Conversion right triggered | conversion_right     1     1    
Conversion Rate     141.4827 141.48       141.4827
Subsequent Event | Convertible Notes | Notes Due February 1, 2033                
Debt Instrument [Line Items]                
Common stock trigger price | $ / shares   $ 9.19            
Convertible debt, threshold percentage of stock price trigger   130.00%            
Conversion Price | $ / shares   $ 7.07            
Number of trading days | d   20            
Number of consecutive trading days applicable conversion price   30 days            
Conversion right triggered | conversion_right   1            
Conversion Rate   141.4827            
Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Credit line capacity $ 175,000,000.0              
Higher borrowing capacity option $ 275,000,000.0              
Commitment fee percentage 0.25%              
Swingline | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Credit line capacity $ 20,000,000.0              
Letter of Credit | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Credit line capacity $ 20,000,000.0              
LIBOR | Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 2.50%              
LIBOR, First 12 Months | Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.35%              
LIBOR Thereafter | Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 0.50%              
LIBOR, First 12 Months, Adjusted for Eurocurrency Liabilities | Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.35%              
LIBOR, Thereafter, Adjusted for Eurocurrency Liabilities | Revolving Credit Facility | Subsequent Event | Line of Credit | New Credit Agreement                
Debt Instrument [Line Items]                
Basis spread on variable rate 1.50%