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Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan Stock-based Compensation: Incentive Award Plan and Employee Stock Purchase Plan (Stock Options Activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Outstanding Stock Options Activity [Roll Forward]    
Outstanding at December 31, 2012 (in shares) 859,945  
Exercisable at December 31, 2012 (in shares) 691,349  
Options Outstanding, Weighted Average Exercise Price [Roll Forward]    
Outstanding - weighted average exercise price per share at January 1, 2012 $ 9.83  
Exercised, weighted average exercise price per share $ 8.13  
Canceled, weighted average exercise price per share $ 9.65  
Outstanding - weighted average exercise price per share at December 31, 2012 $ 10.61 $ 9.83
Vested and Expected to Vest, weighted average exercise price per share $ 10.56  
Exercisable, weighted average exercise price per share $ 10.34  
Outstanding, weighted average remaining contractual term at January 1, 2012 4 years 9 months 18 days 5 years 7 months 6 days
Outstanding, weighted average remaining contractual term at December 31, 2012 4 years 9 months 18 days 5 years 7 months 6 days
Vested and Expected to Vest, weighted average remaining contractual term 4 years 8 months 12 days  
Exercisable, weighted average remaining contractual term 4 years  
Options outstanding - aggregate intrinsic value at January 1, 2012 $ 13,442  
Options outstanding - aggregate intrinsic value at December 31, 2012 20,903 13,442
Vested and Expected to Vest, aggregate intrinsic value 20,521  
Exercisable, aggregate intrinsic value $ 16,995  
Incentive Stock Options [Member]
    
Outstanding Stock Options Activity [Roll Forward]    
Outstanding at January 1, 2012 (in shares) 129,423  
Exercised (in shares) (59,806)  
Canceled (in shares) (201)  
Outstanding at December 31, 2012 (in shares) 69,416  
Vested and Expected to Vest at December 31, 2012 (in shares) 69,416  
Exercisable at December 31, 2012 (in shares) 69,386  
Non Qualified Stock Options [Member]
    
Outstanding Stock Options Activity [Roll Forward]    
Outstanding at January 1, 2012 (in shares) 1,156,937  
Exercised (in shares) (333,377)  
Canceled (in shares) (33,031)  
Outstanding at December 31, 2012 (in shares) 790,529  
Vested and Expected to Vest at December 31, 2012 (in shares) 772,942  
Exercisable at December 31, 2012 (in shares) 621,963