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Accumulated Other Comprehensive Loss - Amounts Reclassified from Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Tax (expense) benefit $ (16,788) $ (9,215) $ (17,066) $ (26,003) $ (26,506)
Reclassification out of Accumulated Other Comprehensive Income          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Net of tax 216     431  
Interest rate contract | Loss on Cash Flow Hedge | Reclassification out of Accumulated Other Comprehensive Income          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Interest expense 216     431  
Tax (expense) benefit $ 0     $ 0