Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Taxes [Abstract]
Unrecognized tax benefits	$ 11,200		$ 11,200		$ 11,100
Gross increase (decrease) in unrecognized tax benefits			(52)
Accrual for interest related to uncertain tax positions	$ 1,000		$ 1,000
Effective tax rate	28.00%	23.00%	26.00%	23.00%
U.S. federal statutory rate			35.00%
Hungary statutory tax rate			19.00%
Tax benefits recognized due to differences in Hungary statutory rates from the statutory U.S. tax rate	$ 837	$ 2,400	$ 1,700	$ 4,000
Tax benefits resulting from the partial release of the valuation allowance on assets from the restructuring and the enhanced tax deduction for research expenses in Hungary	2,400	3,200	4,200	5,800
Foreign income tax benefit	$ 1,300	$ 6	$ 1,800	$ 311