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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 842,292	$ 737,873	$ 841,574	$ 735,618
Merger-related adjustments		5,670		5,670
Total other comprehensive income (loss)	(5,320)	7,475	(8,545)	12,182
Ending balance	832,890	830,725	832,890	830,725
Valuation adjustment	1,100		1,800
Adjustments related to TCJA				300
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	2,548	3,194	5,773	1,197
Gain (loss) recognized in other comprehensive income (loss), net of tax provision of $0, $472, $0 and $888, respectively (1)	(4,529)	479	(6,828)	2,051
(Gain) loss reclassified from accumulated other comprehensive income (loss) to interest expense, net of tax benefit of $0, $(8), $0 and $(53), respectively	(791)	31	(1,717)	456
Merger-related adjustments	0	5,670	0	5,670
Total other comprehensive income (loss)	(5,320)	6,180	(8,545)	8,177
Ending balance	(2,772)	9,374	(2,772)	9,374
Gain recognized in other comprehensive income, tax	0	472	0	888
Loss reclassified from accumulated other comprehensive loss, tax	$ 0	$ (8)	$ 0	$ (53)

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Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect

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

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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