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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:                            
Federal                       $ (20,824) $ 58,507 $ 10,621
State                       (403) 14,691 (759)
Foreign                       9,195 15,545 2,968
Current Income Tax Expense (Benefit)                       (12,032) 88,743 12,830
Deferred:                            
Federal                       41,986 (53,711) 62,704
State                       (997) (4,325) (431)
Foreign                       (6,162) (4,410) 1,482
Provision for valuation allowance on deferred tax assets                       3,601 15,764 0
Deferred Income Tax Expense (Benefit)                       38,428 (46,682) 63,755
Total $ 10,832 $ 2,022 $ 2,992 $ 10,165 $ 11,217 $ 18,309 $ 8,873 $ 8,496 $ 6,383 $ 21,866 $ 24,374 $ 26,396 $ 42,061 $ 76,585