|
Stock-based Compensation - Additional Information (Narrative) (Details)
|
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Number of common stock shares reserved for issuance under Long Term Incentive Plan | 417,649 | ||
| Number of common stock shares available for grant under Long Term Incentive Plan | 7,808 | ||
| Weighted average period for unrecognized stock-based compensation expense | 211 days | ||
| Restricted Stock Award Units | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Granted (in shares) | 35,752 | 45,914 | 389,057 |