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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Jun. 30, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]          
Difference between effective tax rate and federal statutory     3.90%    
Adjustment of valuation allowance (reverse) $ (12,388) $ (17,000)      
Net operating loss carryforwards 42,202   52,177 42,202  
Non-cash income tax benefit from reversal of valuation allowance 5,372 6,221      
Valuation allowance     0    
Increase (decrease) in deferred income tax assets valuation allowance       (8,781) (25,892)
Deferred income tax assets 1,949   5,725 1,949  
Loss carryforwards, U.S. federal income tax purposes 0   6,856 0  
Loss carryforwards, U.S. state income tax purposes 41,047   38,934 41,047  
Loss carryforwards, U.S. foreign income tax purposes 1,155   6,387 1,155  
Excess tax deduction for exercise of stock options     26,038 1,514  
Unremitted earnings of foreign subsidiaries     19,752    
Increase (decrease) in ASC 740 reserve     (852) (298)  
Decrease of unrecognized tax benefits     (459) (82)  
Period that no additional unrecognized tax benefits anticipated     12 months    
U.S. Deferred Tax Assets [Member]
          
Income Taxes [Line Items]          
Increase (decrease) in deferred income tax assets valuation allowance       (8,781) (25,892)
U.S. Federal Income Tax [Member]
          
Income Taxes [Line Items]          
Research and experimentation tax credit carryforwards 735   2,040 735  
U.S. State Income Tax [Member]
          
Income Taxes [Line Items]          
Net operating loss carryforwards 7,602     7,602  
Research and experimentation tax credit carryforwards 2,040   58 2,040  
Other tax credits $ 615   $ 615 $ 615  
U.S. State Income Tax [Member] | Minimum [Member]
          
Income Taxes [Line Items]          
Operating loss carryforwards, expiration beginning period     Dec. 31, 2014    
Foreign Income Tax [Member] | Minimum [Member]
          
Income Taxes [Line Items]          
Operating loss carryforwards, expiration beginning period     Dec. 31, 2018    
Federal And State Income Tax [Member] | Minimum [Member]
          
Income Taxes [Line Items]          
Tax credit carryforward beginning expiration date     Dec. 31, 2017 Dec. 31, 2017