Derivatives Pre-Tax Gains (Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pre-tax, accumulated other comprehensive income (loss)	$ (21,258)	$ (2,441)
Designated as Hedging Instrument [Member] | Interest rate swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on interest rate cash flow hedges, pre-tax, accumulated other comprehensive income (loss)	(21,258)	(2,441)
Designated as Hedging Instrument [Member] | Interest rate swap [Member] | Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Cash flow hedge gain (loss), reclassified to interest expense, before tax	$ (341)	$ 114