Derivative Instruments, Hedging Activities and Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Gains (Losses) on Cash Flow Hedges
December 31, 2016	$ 11,223
September 30, 2017	9,972
Income Tax Expense
December 31, 2016	(4,435)
September 30, 2017	(3,954)
Accumulated Other Comprehensive Income (Loss), net of taxes
December 31, 2016	6,788
September 30, 2017	6,018
Gains (Losses) on Cash Flow Hedges
Gains (Losses) on Cash Flow Hedges
Net change in unrealized gain (loss)	(1,789)
Amounts reclassified from accumulated other comprehensive income (loss) to interest expense	538
Net current period accumulated other comprehensive income (loss)	(1,251)
Income Tax Expense
Net change in unrealized gain (loss)	698
Amounts reclassified from accumulated other comprehensive income (loss) to interest expense	(217)
Net current period accumulated other comprehensive income (loss)	481
Accumulated Other Comprehensive Income (Loss), net of taxes
Net change in unrealized gain (loss)	(1,091)
Amounts reclassified from accumulated other comprehensive income (loss) to interest expense	321
Net current period accumulated other comprehensive income (loss)	$ (770)