Changes in Accumulated Other Comprehensive Income (Loss) - Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 369,275	$ 353,396	$ 273,456
Other comprehensive income (loss)	(2,689)	(23,331)	27,085
Amounts reclassified from accumulated other comprehensive loss	19,395	794	717
Ending balance	318,420	369,275	353,396
Total Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(42,685)	(20,148)	(47,950)
Ending balance	(25,979)	(42,685)	(20,148)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(18,458)	(2,221)	(27,885)
Other comprehensive income (loss)		(16,237)	25,664
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	(18,022)	(18,458)	(2,221)
Defined Benefit Pension Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(22,253)	(18,049)	(20,065)
Other comprehensive income (loss)	(222)	(4,998)	1,299
Amounts reclassified from accumulated other comprehensive loss	19,395	794	717
Ending balance	(3,080)	(22,253)	(18,049)
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,974)	122	0
Other comprehensive income (loss)		(2,096)	122
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Ending balance	$ (4,877)	$ (1,974)	$ 122