Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity
Beginning balance	$ 950,873	$ 832,890	$ 1,085,963	$ 841,574
Total other comprehensive income (loss)	935	(1,415)	(4,586)	(9,960)
Ending balance	949,685	1,057,018	949,685	1,057,018
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity
Beginning balance	(6,908)	(2,772)	(1,387)	5,773
Loss recognized in other comprehensive income (loss), net of tax benefit of $18, $0, $1,764 and $0, respectively	(69)	(933)	(6,635)	(7,761)
(Gain) loss reclassified from accumulated other comprehensive income (loss) to interest expense, net of tax benefit of $267, $0, $545 and $0, respectively	1,004	(482)	2,049	(2,199)
Total other comprehensive income (loss)	935	(1,415)	(4,586)	(9,960)
Ending balance	(5,973)	(4,187)	(5,973)	(4,187)
Loss recognized in other comprehensive income, tax expense (benefit)	(18)	0	(1,764)	0
(Gain) loss reclassified from accumulated other comprehensive loss, tax expense (benefit)	$ 267	0	$ 545	0
Valuation adjustment		$ 300		$ 2,100