Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (1,440)	$ (1,138)	$ (1,477)	$ (1,395)
Accumulated other comprehensive income (loss), beginning balance	(79,866)	(99,012)
Other comprehensive income (loss) before reclassifications:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	58	392
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(21)	(135)
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	2,008	3,408
Negative prior service cost (reclassified to salaries, wages and benefits)	(13)	(26)
Income tax expense	(745)	(1,362)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	37	257
Other comprehensive income, net of tax	1,308	2,412
Accumulated other comprehensive income (loss), ending balance	(78,558)	(96,600)
Total comprehensive income (loss)	11,296	10,630
Pension Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(77,088)	(97,302)
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	1,937	3,368
Income tax expense	(703)	(1,222)
Other comprehensive income, net of tax	1,234	2,146
Accumulated other comprehensive income (loss), ending balance	(75,854)	(95,156)
Post-Retirement Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(1,301)	(315)
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	71	40
Negative prior service cost (reclassified to salaries, wages and benefits)	(13)	(26)
Income tax expense	(21)	(5)
Other comprehensive income, net of tax	37	9
Accumulated other comprehensive income (loss), ending balance	$ (1,264)	$ (306)