Other Long-Term Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Liabilities, Other than Long-term Debt, Noncurrent [Abstract]
Deferred income taxes	$ 31,214	$ 32,110
Pension and post retirement liabilities	10,936	11,175
Environmental liabilities	1,100	1,100
Other liabilities	4,204	1,523
Other Liabilities, Noncurrent	$ 47,454	$ 45,908