Income Taxes (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Undistributed earnings of foreign subsidiaries	$ 12,600
Additional repatriation taxes	500
Deferred tax assets, valuation allowance	276	$ 2
Total net income tax payments	(7,900)	152,200	$ 122,900
Accrued interest and penalties	411	146
Estimate accelerated deductions, gross	13,500	$ 16,200	$ 21,800
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards related to state income taxes	9,600
Deferred tax assets, valuation allowance	$ 280