Accumulated OCI, Reclassifications Out of Accumulated OCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 3,834	$ 4,105
Income tax benefit	9,371	0
Net of tax	(15,261)	13,897
Amounts reclassified from accumulated other comprehensive income to: [Member] | Interest Rate Swaps [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	0	133
Income tax benefit	0	(53)
Net of tax	$ 0	$ 80