Income Taxes (Reconciliation of effective tax rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation between statutory rate and income tax provision
U.S. federal tax at 35%	$ 23,637	$ 47,627	$ 43,396
State taxes, net of federal benefit	2,622	1,940	1,124
Foreign income taxed at different rates	(11,756)	6,579	(17,814)
Foreign exchange (loss) gain	(5,680)	(17,321)	844
Change in valuation allowance	18,259	(13,527)	(32,415)
Adjustments related to prior years	(912)	3,643	2,727
Income tax credits generated	(1,919)	(2,557)	(2,622)
Repatriation of foreign earnings and profits	91	3,958	6,499
Expiration of capital loss carryforward	0	0	15,555
Expiration of net operating losses	74	2,534	0
Non-deductible loss on acquisition of J-Devices (Note 3)	4,857	0	0
Debt conversion costs	0	0	4,067
Other	(1,238)	969	1,285
Income tax expense	$ 28,035	$ 33,845	$ 22,646
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%