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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 |

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