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Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 181,321	$ 172,521
Other comprehensive income (loss)	$ (904)	$ 174	(3,837)	234
Ending balance	183,304	177,537	183,304	177,537
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,928	1,226	1,544	1,163
Unrealized gains (losses) arising during the period	175	(263)	661	(167)
Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017)	(37)	92	(139)	59
Other comprehensive income (loss)	138	(171)	522	(108)
Ending balance	$ 2,066	$ 1,055	$ 2,066	$ 1,055

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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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