Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Mar. 31, 2014 Incentive Compensation Accrual, Before Tax	Mar. 31, 2014 Incentive Compensation Accrual, After Tax	Mar. 31, 2014 Tax Expense Due on Royalty Income	Jun. 30, 2014 Severance Accrual, Before Tax	Jun. 30, 2014 Severance Accrual, After Tax
Change in Accounting Estimate [Line Items]
Changes in estimate			$ (1,420)	$ (923)	$ 1,100	$ 2,105	$ 1,579
Allocated expenses	3,368	11,965
Prior Period Reclassification Adjustment		(16,673)
Noncash Investing and Financing Items [Abstract]
Purchases of property and equipment included in accounts payable	16,919	6,877
Noncash capitalized patent defense costs	$ 7,123	$ 781