Derivatives and Hedging - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Gains (Losses) on Cash Flow Hedges
Balance as of December 31, 2017	$ 13,187
Balance as of June 30, 2018	18,502
Income Tax Expense
Balance as of December 31, 2017	(4,957)
Net current period accumulated other comprehensive income (loss)	(1,400)
Balance as of June 30, 2018	(6,377)
Accumulated Other Comprehensive Income (Loss), net of taxes
Balance as of December 31, 2017	8,230
Balance as of June 30, 2018	12,125
Gains (Losses) on Cash Flow Hedges
Gains (Losses) on Cash Flow Hedges
Net change in unrealized gain (loss)	5,315
Net current period accumulated other comprehensive income (loss)	5,315
Income Tax Expense
Net change in unrealized gain (loss)	(1,420)
Net current period accumulated other comprehensive income (loss)	(1,420)
Accumulated Other Comprehensive Income (Loss), net of taxes
Net change in unrealized gain (loss)	3,895
Net current period accumulated other comprehensive income (loss)	$ 3,895