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Accumulated Other Comprehensive Loss - Amounts Reclassified from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Tax (expense) benefit $ (22,635) $ (9,215) $ (20,849) $ (48,638) $ (47,355)
Reclassification out of Accumulated Other Comprehensive Income          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Net of tax 215     646  
Interest rate contract | Loss on Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Interest expense 215     646  
Tax (expense) benefit $ 0     $ 0