Other Comprehensive (Loss) Income and Accumulated Other Comprehensive Loss - Components of 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
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		$ 705,103	$ 666,637	$ 714,551	$ 660,417
Current period other comprehensive (loss) income:
Total current period other comprehensive (loss) income		3,671	(3,281)	(7,616)	(5,851)
Balance		726,911	685,502	726,911	685,502
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(15,209)	(14,055)	(10,995)	(14,168)
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications		3,881	(2,858)	(940)	(2,582)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	0
Effect of taxes	[2]	(714)	196	(107)	33
Total current period other comprehensive (loss) income		3,167	(2,662)	(1,047)	(2,549)
Balance		(12,042)	(16,717)	(12,042)	(16,717)
Gain on Sale of Interest Rate Hedge Agreement
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[3]	1,368	1,898	1,634	2,164
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications	[3]	0
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[3]	(180)	(180)	(540)	(540)
Effect of taxes	[2],[3]	47	47	141	141
Total current period other comprehensive (loss) income	[3]	(133)	(133)	(399)	(399)
Balance	[3]	1,235	1,765	1,235	1,765
Change in Fair Value of Interest Rate Hedge Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	[4]	(9,590)	(2,964)	(2,783)	(547)
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications	[4]	(45)	(746)	(10,200)	(4,083)
Amounts reclassified from accumulated other comprehensive (loss) income	[1],[4]	909	90	1,832	144
Effect of taxes	[2],[4]	(227)	170	2,198	1,036
Total current period other comprehensive (loss) income	[4]	637	(486)	(6,170)	(2,903)
Balance	[4]	(8,953)	(3,450)	(8,953)	(3,450)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Balance		(23,431)	(15,121)	(12,144)	(12,551)
Current period other comprehensive (loss) income:
Other comprehensive income (loss) before reclassifications		3,836	(3,604)	(11,140)	(6,665)
Amounts reclassified from accumulated other comprehensive (loss) income	[1]	729	(90)	1,292	(396)
Effect of taxes	[2]	(894)	413	2,232	1,210
Total current period other comprehensive (loss) income		3,671	(3,281)	(7,616)	(5,851)
Balance		$ (19,760)	$ (18,402)	$ (19,760)	$ (18,402)

[1] The Company expects to reclassify $0.7 million net gains related to the Gain on Sale of Interest Rate Hedge Agreement and $3.7 million net 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 three months ended September 30, 2020 and 2019 was 27.2% and 23.6%, respectively, and 25.7% and 23.2% for the nine months ended September 30, 2020 and 2019, respectively.

[3] Represents the unamortized 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, at the date of the sale, was recorded in other comprehensive income, net of tax, and is being reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from January 31, 2018 to January 31, 2023 (see Note 10—Derivative Instruments and Hedging Activities).

[4] Represents the change in fair value of interest rate hedge agreements designated as a cash flow hedge.  The fair value of the interest rate hedge agreements was recorded in other comprehensive income and will be reclassified to interest expense when earnings are impacted by the hedged items and as interest payments are made on the Credit Facility from August 31, 2018 to February 28, 2025 (see Note 10—Derivative Instruments and Hedging Activities).