Retirement Plans - Components of Prepaid (Accrued) Cost (Details 3) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
U.S.Pension Plans
Retirement Plans
Prepaid pension asset	$ 46,183	$ 33,779
Accrued expenses and other liabilities	(317)	0
Long-term pension obligations	(1,098)	(1,388)
Components of prepaid (accrued) cost, net	44,768	32,391
Non-U.S. Pension Plans
Retirement Plans
Prepaid pension asset	0	0
Accrued expenses and other liabilities	0	0
Long-term pension obligations	(1,343)	(1,316)
Components of prepaid (accrued) cost, net	(1,343)	(1,316)
Post-Retirement Life Insurance Plan
Retirement Plans
Accrued expenses and other liabilities	(387)	(360)
Long-term pension obligations	(4,565)	(4,526)
Components of prepaid (accrued) cost, net	$ (4,952)	$ (4,886)