Common Stock-Narrative (Details) |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2015
class_of_stock
$ / shares
shares
|
Aug. 16, 2014
shares
|
|
| Class of Stock [Line Items] | ||
| Number of classes of common stock (class of stock) | class_of_stock | 2 | |
| Class A Common Stock | ||
| Class of Stock [Line Items] | ||
| Approval rate to waive equal consideration rights (ratio) | 75.00% | |
| Shares repurchased (in shares) | 517,700 | |
| Average cost (usd per share) | $ / shares | $ 6.62 | |
| Class B Common Stock | ||
| Class of Stock [Line Items] | ||
| Shares repurchased (in shares) | 0 | |
| 2014 Repurchase Authorization | ||
| Class of Stock [Line Items] | ||
| Remaining number of shares authorized to be repurchased | 1,455,300 | |
| 2014 Repurchase Authorization | Common Stock | ||
| Class of Stock [Line Items] | ||
| Number of shares authorized to be repurchased | 2,000,000 |