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Stock Option and Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 01, 2015
Jan. 01, 2014
Aug. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock Option and Compensation Plans                  
Share-based compensation expense       $ 13,040 $ 2,871 $ 640      
2007 Plan                  
Stock Option and Compensation Plans                  
Number of shares of common stock available for issuance under the Plan     739,317            
2013 Plan                  
Stock Option and Compensation Plans                  
Increase in number of shares available under the Plan 1,360,000 1,257,000              
Number of shares of common stock available for issuance under the Plan             479,000    
Annual increase in shares reserved for issuance under the Plan     2,542,372            
Annual increase in shares reserved for issuance under the Plan (as a percent)     4.00%            
2013 Plan | Maximum                  
Stock Option and Compensation Plans                  
Number of shares reserved for issuance under the Plan     3,359,641            
Options outstanding                  
Stock Option and Compensation Plans                  
Awards outstanding (in shares) 3,680,000 2,708,000   2,708,000 1,344,000 1,113,000 3,680,000 2,708,000 1,344,000
Common Stock Options                  
Outstanding at beginning of year: (in shares) 3,680,000 2,708,000   2,708,000 1,344,000 1,113,000      
Granted (in shares)       1,744,000 1,583,000 250,000      
Exercised (in shares)       (621,000) (151,000) (19,000)      
Expired or forfeited (in shares)       (151,000) (68,000)        
Outstanding at end of year: (in shares)       3,680,000 2,708,000 1,344,000      
Weighted Average Exercise Price                  
Outstanding at beginning of year: (in dollars per share) $ 21.03 $ 9.41   $ 9.41 $ 1.65 $ 1.30      
Granted (in dollars per share)       33.92 14.82 3.12      
Exercised (in dollars per share)       4.75 0.61 0.12      
Expired or forfeited (in dollars per share)       28.50 1.53        
Outstanding at end of year: (in dollars per share)       21.03 9.41 1.65      
Additional disclosures                  
Options exercisable at end of year (in shares)             993,000 984,000 823,000
Weighted average grant date fair value (per share) of options granted during the period (in dollars per share)       $ 24.41 $ 10.48 $ 1.65