Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended			6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Minimum [Member]	Dec. 31, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Dec. 31, 2013 Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Vesting period of equity awards						2 years		4 years
Useful life of patents and patent rights							1 year		9 years
Cash Paid For Foreign Income Taxes	$ 1,555,000	$ 28,000		$ 3,730,000	$ 11,890,000
Estimated annual effective tax rate				40.00%
Effective tax rate					25.00%
Excess tax benefits from stock-based compensation				847,000	10,850,000
Business acquisition deferred tax asset			1,900,000
Income tax benefit from release of valuation allowance			$ 10,200,000	$ 0	$ 10,237,000