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Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 181,321	$ 172,521
Other comprehensive loss	$ (1,677)	$ (263)	(5,514)	(29)
Ending balance	184,661	179,882	184,661	179,882
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2,066	1,055	1,544	1,163
Unrealized gains (losses) arising during the period	273	(31)	934	(198)
Related deferred taxes (at a Federal Income Tax rate of 21% for September 30, 2018 and 35% for September 30, 2017)	(57)	11	(196)	70
Other comprehensive loss	216	(20)	738	(128)
Ending balance	$ 2,282	$ 1,035	$ 2,282	$ 1,035

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Amount before tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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