Equity Compensation Plans (Restricted Stock Activity) (Details) - Unvested restricted shares
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested PBUs at December 31, 2014 | shares 2,411,914
Granted | shares 1,426,604
Vested | shares (1,422,670)
Forfeited | shares (119,499)
Unvested PBUs at December 31, 2015 | shares 2,296,349
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted-Average Grant Date Fair Value, Outstanding at beginning of period | $ / shares $ 2.79
Granted | $ / shares 2.40
Vested | $ / shares 2.67
Forfeited | $ / shares 2.58
Weighted-Average Grant Date Fair Value, Outstanding at end of period | $ / shares $ 2.63
Weighted Average Remaining Contractual Term (in years) 1 year 2 months 23 days
Aggregate Intrinsic Value | $ $ 3,008