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Income Taxes - Schedule of Effective Income Tax Reconciliation (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
Income Tax Disclosure [Abstract]                            
Expected income tax expense at statutory rate                       $ (155,106) $ 123,368 $ 90,127
Differences between expected and actual income tax expense:                            
Impairment of goodwill                       92,034 0 0
State tax, after Federal tax benefit                       (1,084) 5,639 (1,184)
Provision for liability for selected tax items                       6,084 12,218 5,558
Non-deductible regulatory settlements                       53,375 0 0
Other permanent differences                       (254) (636) 15
Foreign tax differential                       27,799 (112,997) (17,816)
Provision for valuation allowance on deferred tax assets                       3,601 15,764 0
Other                       (53) (1,295) (115)
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