Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Plan Obligations (Textual) [Abstract]
Company's expense for its defined contribution plans	$ 8,700	$ 11,200	$ 10,300
Pension settlement charge	48,344	$ 0	$ 0
Contributions to fund pension trust	$ 3,100
Supplemental Employee Retirement Plan
Employee Benefit Plan Obligations (Textual) [Abstract]
Calculated rate for the supplemental employee retirement plan	2.60%	2.40%	2.90%
Discount rate	2.40%	2.90%	2.10%
Other (income) and expenses, net
Employee Benefit Plan Obligations (Textual) [Abstract]
Pension settlement charge	$ 51,400
Pension settlement charges	$ 31,900