Comprehensive Income (Details 2) - Equity Component [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign Currency Translation Adjustments, Beginning balance, December 31, 2014			$ (2,894)
Foreign Currency Translation Adjustments, Other comprehensive loss before reclassifications			(1,212)
Foreign Currency Translation Adjustments, Amounts reclassified from accumulated other comprehensive loss			0
Foreign Currency Translation Adjustments, Net current period other comprehensive (loss) income			(1,212)
Foreign Currency Translation Adjustments, Ending balance, June 30, 2015	$ (4,106)		(4,106)
Defined Benefit Pension Items, Beginning balance, December 31, 2014			(15,136)
Defined Benefit Pension Items, Other comprehensive loss before reclassifications			0
Defined Benefit Pension Items, Amounts reclassified from accumulated other comprehensive loss	272	$ 96	543	$ 216
Defined Benefit Pension Items, Net current period other comprehensive (loss) income			543
Defined Benefit Pension Items, Ending balance, June 30, 2015	(14,593)		(14,593)
Beginning balance, December 31, 2014			(18,030)
Other comprehensive loss before reclassifications			(1,212)
Amounts reclassified from accumulated other comprehensive loss			543
Net current period other comprehensive (loss) income			(669)
Ending balance, June 30, 2015	$ (18,699)		$ (18,699)