(Narratives)(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
U.S. federal statutory tax rate	35.00%	35.00%	35.00%
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 1,000	$ 1,000
Accumulated net earning	249,567	154,562
Gross deferred tax assets	29,200	24,100
Gross deferred tax liabilities	89,700	$ 71,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	800		$ 900
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	8,800
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	4,900
Accumulated net earning	$ 11,000