Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		$ 746,961		$ 714,551	$ 660,417
Total current period other comprehensive income (loss)		3,071		(1,962)	407
Balance		803,470		746,961	714,551
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(7,210)		(10,995)	(14,168)
Other comprehensive income (loss) before reclassifications		(1,676)		4,141	2,338
Amounts reclassified from accumulated other comprehensive (loss) income		0	[1]	0	0
Effect of taxes	[2]	127		(356)	835
Total current period other comprehensive income (loss)		(1,549)		3,785	3,173
Balance		(8,759)		(7,210)	(10,995)
Gain on Sale of Interest Rate Hedge Agreement
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[3]	1,096		1,634	2,164
Other comprehensive income (loss) before reclassifications	[3]	0		0	0
Amounts reclassified from accumulated other comprehensive (loss) income	[3]	(720)	[1]	(720)	(720)
Effect of taxes	[2],[3]	193		182	190
Total current period other comprehensive income (loss)	[3]	(527)		(538)	(530)
Balance	[3]	569		1,096	1,634
Changes in Fair Value of Interest Rate Hedge Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[4],[5]	(7,992)		(2,783)	(547)
Other comprehensive income (loss) before reclassifications	[4],[5]	3,285		(9,867)	(3,362)
Amounts reclassified from accumulated other comprehensive (loss) income	[4],[5]	3,728	[1]	2,751	333
Effect of taxes	[2],[4],[5]	(1,866)		1,907	793
Total current period other comprehensive income (loss)	[4],[5]	5,147		(5,209)	(2,236)
Balance	[4],[5]	(2,845)		(7,992)	(2,783)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(14,106)		(12,144)	(12,551)
Other comprehensive income (loss) before reclassifications		1,609		(5,726)	(1,024)
Amounts reclassified from accumulated other comprehensive (loss) income		3,008	[1]	2,031	(387)
Effect of taxes	[2]	(1,546)		1,733	1,818
Total current period other comprehensive income (loss)		3,071		(1,962)	407
Balance		$ (11,035)		$ (14,106)	$ (12,144)

[1] The Company expects to reclassify $0.7 million related to the Gain on Sale of Interest Rate Hedge Agreement, and $3.0 million losses related to the Change in Fair Value of Interest Rate Hedge Agreement from accumulated other comprehensive loss into earnings during the next 12 months.

[2] The Company’s effective tax rate for the years ended December 31, 2021, 2020, and 2019 was 28.9%, 26.4%, and 23.6%, respectively.

[3] Represents the fair value of an interest rate hedge agreement, designated as a cash flow hedge, which was sold on December 1, 2016. The fair value of the interest rate hedge agreement was recorded in other comprehensive income, net of tax, and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023.

[4] Represents the change in fair value of interest rate hedge agreements designated as a cash flow hedges.  The fair value of the interest rate hedge agreements was recorded in other comprehensive income and will be reclassified to earnings when earnings are impacted by the hedged items, as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025. See additional details of the hedge agreements in Note 12 - Derivative Instruments and Hedging Activities.

[5] The fair value of the interest rate hedge agreements is included in other current and other long-term liabilities on the consolidated balance sheets.