Changes in Accumulated Other Comprehensive Income - Schedule of Changes in AOCI(L) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Defined benefit pension, balance January 1	$ (9,219,000)	$ (8,796,000)
Foreign currency translation, balance January 1	15,476,000	1,044,000
Total, balance January 1	6,257,000	(7,752,000)
Other comprehensive income (loss) before reclassifications, defined benefit plan	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(4,980,000)	14,432,000
Total, other comprehensive income (loss) before reclassifications	(4,980,000)	14,432,000
Defined benefit pension, amounts reclassified from accumulated other comprehensive income (loss)	(3,101,000)	(423,000)
Foreign currency translation, amounts reclassified from accumulated other comprehensive income (loss)	0	0
Pension and other postretirement benefit plans, tax	0	0	$ 1,112,000
Total, amounts reclassified from accumulated other comprehensive income (loss)	(3,101,000)	(423,000)
Defined benefit pension, other comprehensive income (loss)	(3,101,000)	(423,000)	(10,403,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(4,980,000)	14,432,000
Total, other comprehensive income (loss)	(8,081,000)	14,009,000
Defined benefit pension, balance December 31	(12,320,000)	(9,219,000)	(8,796,000)
Foreign currency translation, balance December 31	10,496,000	15,476,000	1,044,000
Total, balance December 31	$ (1,824,000)	$ 6,257,000	$ (7,752,000)