Derivatives and Hedging - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Gains (Losses) on Cash Flow Hedges
Balance as of December 31, 2017	$ 13,187
Balance as of September 30, 2018	18,988
Income Tax Expense
Balance as of December 31, 2017	(4,957)
Net current period accumulated other comprehensive income (loss)	(1,441)
Balance as of September 30, 2018	(6,398)
Accumulated Other Comprehensive Income (Loss), net of taxes
Balance as of December 31, 2017	8,230
Balance as of September 30, 2018	12,590
Gains (Losses) on Cash Flow Hedges
Gains (Losses) on Cash Flow Hedges
Net change in unrealized gain (loss)	5,801
Net current period accumulated other comprehensive income (loss)	5,801
Income Tax Expense
Net change in unrealized gain (loss)	(1,441)
Net current period accumulated other comprehensive income (loss)	(1,441)
Accumulated Other Comprehensive Income (Loss), net of taxes
Net change in unrealized gain (loss)	4,360
Net current period accumulated other comprehensive income (loss)	$ 4,360