Fair Value (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unrealized gain (loss) on derivative, net of tax	$ (853)	$ 82	$ (4,399)	$ 1,159
Amounts reclassified from accumulated other comprehensive loss, net of tax			605
Interest Rate Swap [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Interest rate swap notional amount	$ 146,300		$ 146,300		$ 150,000	$ 155,300
Fixed interest rate	2.928%		2.928%		2.928%	1.4935%
Fair value of interest rate swap	$ 7,700		$ 7,700		$ 3,000
Unrealized loss on interest rate swap			4,700
Unrealized gain (loss) on derivative, net of tax			3,500
Gain On Contract Termination					$ 3,500
Amounts reclassified from accumulated other comprehensive loss			1,200
Amounts reclassified from accumulated other comprehensive loss, net of tax			$ 900