Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes, net of noncontrolling interest										$ 28,111	$ 53,156	$ (20,525)
Income tax benefit										(13,051)	(11,931)	63,134
Net income		$ 5,667	$ (5,870)	$ 29,411	$ (14,148)	$ 23,669	$ (1,875)	$ 21,413	$ (1,982)	15,060	41,225	42,609
Reclassification out of Accumulated Other Comprehensive Income
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Net income										11,890	(514)	(347)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior-service cost
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior-service cost										911	910	455
Income (loss) before income taxes, net of noncontrolling interest										(911)	(910)	(455)
Income tax benefit										(228)	(238)	(108)
Net income										(683)	(672)	$ (347)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes, net of noncontrolling interest										1,210
Income tax benefit										303
Net income										907
Interest payments										1,210
Reclassification out of Accumulated Other Comprehensive Income | Recognition of gain on sale of investment
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior-service cost											(214)
Income (loss) before income taxes, net of noncontrolling interest	[1]										214
Income tax benefit											56
Net income	[1]										$ 158
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Translation Adjustments
Schedule of Reclassifciations Out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) before income taxes, net of noncontrolling interest										11,666
Income tax benefit										0
Net income										11,666
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net										$ 11,666

[1] All amounts are net of tax. Amounts in parentheses indicate debit