Pension and Other Postretirement Benefits (Details 6) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	[1]	$ (9,586)	$ 42,016	$ (73,168)
Defined benefit pension plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		379
Net loss		(10,493)
Amortization of prior service costs (credits)		213
Amortization of actuarial loss		16,007
Foreign exchange rate changes		1,682
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		7,788
Other postretirement benefit plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Prior service cost		0
Net loss		1,557
Amortization of prior service costs (credits)		(354)
Amortization of actuarial loss		627
Foreign exchange rate changes		(32)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax		$ 1,798

[1] Net of tax of $3,916, $(24,799) and $43,109 for the years ended December 31, 2015, 2014 and 2013, respectively.