Equity Based Plans, Summary of Restricted Stock Cancelled Due to Employee Terminations Prior to Restrictions Lapsing (Details) - Restricted Stock [Member] - $ / shares |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Number of shares (in shares) | 4,965 | 0 | 8,120 |
Weighted average fair value (in dollars per share) | $ 35.78 | $ 0 | $ 23.49 |