Capital Structure and Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 639,594	$ 716,580	$ 1,034,098	$ 1,052,304
Ending Balance	628,495
Unrealized gain on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(2,842)	(3,053)
Other comprehensive loss before reclassifications	211
Amounts reclassified from accumulated other comprehensive loss	0
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(1,097)	(808)
Other comprehensive loss before reclassifications	(289)
Amounts reclassified from accumulated other comprehensive loss	0
Pension and other post-retirement benefits liability
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(21,121)	(15,993)
Other comprehensive loss before reclassifications	(5,823)
Amounts reclassified from accumulated other comprehensive loss	695
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(25,060)	$ (19,854)	$ (15,985)	$ (15,020)
Other comprehensive loss before reclassifications	(5,901)
Amounts reclassified from accumulated other comprehensive loss	$ 695