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Comprehensive Income (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Comprehensive Income (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign Currency Translation Adjustments, Beginning balance			$ (5,489)
Foreign Currency Translation Adjustments, Other comprehensive income before reclassifications			1,331
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive income			1,331
Foreign Currency Translation Adjustments, Ending balance	$ (4,158)		(4,158)
Defined Benefit Pension Items, Beginning balance			(11,080)
Defined Benefit Pension Items, Other comprehensive income before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	80	$ 256	241	$ 767
Defined Benefit Pension Items, Net current period other comprehensive income			241
Defined Benefit Pension Items, Ending balance	(10,839)		(10,839)
Beginning balance			(16,569)
Other comprehensive income before reclassifications			1,331
Amounts reclassified from accumulated other comprehensive loss			241
Net current period other comprehensive income			1,572
Ending balance	$ (14,997)		$ (14,997)