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Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period			$ 639,519
Total amount reclassified from Accumulated other comprehensive loss, net of tax	$ 0	$ (774)	15,359	$ (774)
Other comprehensive income (loss)	1,020	(25,595)	19,299	(9,866)
Balance at end of period	691,147		691,147
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(117,266)	(95,619)	(115,517)	(97,948)
Tax benefit	(1,384)	(614)	(2,050)	(1,682)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	(1,378)	(3,059)	3,401	5,388
Balance at end of period	(115,888)	(92,560)	(115,888)	(92,560)
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0	0	0
Tax benefit	0	0	0	0
Total amount reclassified from Accumulated other comprehensive loss, net of tax	0	0	0	0
Balance at end of period	0	0	0	0
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from Accumulated other comprehensive loss	11	(131)	(94)	(213)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from Accumulated other comprehensive loss	0	0	0	0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from Accumulated other comprehensive loss	2,751	3,804	5,545	7,283
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amounts reclassified from Accumulated other comprehensive loss	0	0	0	0
Accumulated Other Comprehensive (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative effect of the adoption of new accounting pronouncements	(3,772)		(3,772)
Accumulated Net Investment Gain (Loss) Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(36)	0	(572)	0
Other comprehensive income (loss)	27	0	563	0
Balance at end of period	(9)	0	(9)	0
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Balance at end of period	0	0	0	0
Accumulated Foreign Currency Adjustment Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(87,261)	(60,584)	(102,838)	(73,814)
Total amount reclassified from Accumulated other comprehensive loss, net of tax	0	774	15,359	(774)
Other comprehensive income (loss)	(248)	(27,607)	(30)	(14,377)
Balance at end of period	(87,509)	(88,965)	(87,509)	(88,965)
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	639	971	496	801
Total amount reclassified from Accumulated other comprehensive loss, net of tax	0	0	0	0
Other comprehensive income (loss)	(137)	(273)	6	(103)
Balance at end of period	502	$ 698	502	$ 698
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Cumulative effect of the adoption of new accounting pronouncements	$ (3,772)		$ (3,772)

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