Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Employee Benefit Plan Obligations (Textual) [Abstract]
Company's expense for its defined contribution plans	$ 7,800	$ 8,700	$ 11,200
Pension settlement charge, net of cash contributed	$ 0	$ 48,344	$ 0
Supplemental Employee Retirement Plan
Employee Benefit Plan Obligations (Textual) [Abstract]
Calculated rate for the supplemental employee retirement plan	2.40%	2.60%	2.40%
Discount rate	2.60%	2.40%	2.90%
Other (income) and expenses, net
Employee Benefit Plan Obligations (Textual) [Abstract]
Pension settlement charges	$ 31,900
Pension settlement charge, net of cash contributed	$ 51,400