Organization and Description of Business (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |
12 Months Ended | ||||
|---|---|---|---|---|---|
Mar. 19, 2014 |
Mar. 19, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Class of Stock [Line Items] | |||||
| Stock Issued During Period, Value, New Issues | $ 185,628 | ||||
| Proceeds from Issuance Initial Public Offering | $ 0 | $ 189,943 | $ 0 | ||
| IPO [Member] | |||||
| Class of Stock [Line Items] | |||||
| Stock Issued During Period, Value, New Issues | $ 204,200 | ||||
| Proceeds from Issuance Initial Public Offering | 185,600 | ||||
| Payments of Stock Issuance Costs, Underwriter Fees and Commissions | 14,300 | ||||
| Deferred Offering Costs | $ 4,300 | $ 4,300 | |||
| IPO [Member] | Class B [Member] | |||||
| Class of Stock [Line Items] | |||||
| Stock Issued During Period, Shares, New Issues | 12.8 | 12.8 | |||
| Shares Issued, Price Per Share | $ 16 | $ 16 | |||