Stockholders' Equity AOCI Change (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Beginning Balance $ (45,565) $ (18,743)    
Other comprehensive (loss) income before reclassifications (4,314) (415)    
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax 1,022 [1] 253 [1]    
Net current period other comprehensive income (loss) (3,292) (162)    
Ending Balance (48,857) (18,905)    
Defined Benefit Pension and Postretirement Items        
Accumulated Other Comprehensive Loss, Pension and Other Postretirement Benefit Plans, Net of Tax (34,549) (13,873) (35,571) (14,126)
Other comprehensive (loss) income before reclassifications 0 0    
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax 1,022 [1] 253 [1]    
Net current period other comprehensive income (loss) 1,022 253    
Foreign Currency Items        
Accumulated Other Comprehensive Loss, Foreign Currency Translation Adjustment, Net of Tax (14,308) (5,032) (9,994) (4,617)
Other comprehensive (loss) income before reclassifications (4,314) (415)    
Reclassification from Accumulated Other Comprehensive Loss, Current Period, Net of Tax 0 [1] 0 [1]    
Net current period other comprehensive income (loss) $ (4,314) $ (415)    
[1] See reclassifications from accumulated other comprehensive loss table for details of reclassification from accumulated other comprehensive loss for the three month periods ended March 31, 2015 and 2014