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Equity Narrative (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Nov. 18, 2015
$ / shares
shares
May. 12, 2014
USD ($)
Class of Stock [Line Items]          
Number of share-based compensation plans | plan 3        
Outstanding assumed options (in shares) | shares 70,000        
Number of shares available to be issued (in shares) | shares 26,500,000        
Intrinsic value of options exercised $ 17,181,000 $ 10,566,000 $ 8,864,000    
Intrinsic value of options vested 10,044,000 $ 6,615,000 $ 3,351,000    
Total unrecognized compensation expense $ 6,241,000        
Weighted-average grant date fair value for options granted during the period (in dollars per share) | $ / shares $ 5.15 $ 4.18 $ 3.08    
Shares issued for services performed (in shares) | shares 16,493 15,958      
Stock issuance of 16,493 and 15,958 shares in exchange for services performed in 2015 and 2014, respectively $ 164,000 $ 117,000 $ 0    
Warrants, term 5 years        
Authorized share amount for repurchase $ 60,000,000 $ 20,000,000     $ 10,000,000
Stock repurchase (in shares) | shares 4,610,000        
Shares repurchased, value $ 40,143,000        
Commissions 136,000        
Remaining authorizations under the repurchase program, amount $ 14,274,000        
Common Stock          
Class of Stock [Line Items]          
Shares issued for services performed (in shares) | shares 11,321 15,958      
Consultant | Common Stock          
Class of Stock [Line Items]          
Shares issued for services performed (in shares) | shares 5,172        
Stock issuance of 16,493 and 15,958 shares in exchange for services performed in 2015 and 2014, respectively $ 57,000        
Restricted Stock          
Class of Stock [Line Items]          
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock $ 16,606,000        
Expenses expected to be recognized over a weighted-average period 2 years 1 month 6 days        
Minimum | Restricted Stock          
Class of Stock [Line Items]          
Vesting period 1 year        
Maximum | Restricted Stock          
Class of Stock [Line Items]          
Vesting period 3 years        
Warrants          
Class of Stock [Line Items]          
Warrants outstanding (in shares) | shares       42,400  
Warrants outstanding (in dollars per share) | $ / shares       $ 1.09