Income Taxes - Additional Information (Details 5) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes
Deferred tax assets, operating loss carryforwards	$ 9,387,000	$ 23,095,000
Credit carry-forwards	35,082,000	16,903,000
Deferred tax asset valuation allowance	10,266,000	12,938,000
Foreign tax credit carry-forwards	25,909,000
Research and development credits	7,577,000
Foreign income tax expense	12,482,000	6,981,000	$ 4,804,000
Alternative minimum tax credit carry-forwards	2,565,000
Income tax provision on foreign earnings to be permanently reinvested outside US	116,192,000
Unrecognized tax benefits	11,008,000
Accrued for interest and penalties related to uncertain income tax	$ 1,206,000	$ 0
Maximum
Income Taxes
Open Tax Year	2007
Minimum
Income Taxes
Open Tax Year	2014
Non-U.S. | Income Tax Benefit
Income Taxes
Effects of change in accounting method	$ 16,305,000
Non-U.S. | Operating Carry Forward
Income Taxes
Effects of change in accounting method	(8,214,000)
Non-U.S. | Foreign Tax Credit Carryforward
Income Taxes
Effects of change in accounting method	24,519,000
China
Income Taxes
Tax expense relating to earnings not indefinitely reinvested outside US	$ 7,461,000