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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1,607 $ 2,567
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options outstanding, beginning of period (in shares) 4,602,746  
Granted (in shares) 120,371  
Exercised (in shares) 0  
Forfeited (in shares) 300,332  
Vested options expired (in shares) 326,134  
Options outstanding, end of period (in shares) 4,096,651  
Excisable (in shares) 2,551,045  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Options outstanding, end of period (in dollars per share) $ 8.74  
Granted (in dollars per share) 2.85  
Exercised (in dollars per share) 0.00  
Forfeited (in dollars per share) 7.54  
Vested options expired (in dollars per share) 18.47  
Options outstanding, beginning of period (in dollars per share) 7.88  
Exercisable (in dollars per share) $ 10.02  
Options outstanding, weighted-average remaining contractual term 5 years 11 months 4 days  
Exercisable, weighted-average remaining contractual term 3 years 3 months 7 days  
Unrecognized compensation costs, unvested stock options $ 2,100  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Unrecognized compensation costs, unvested stock option recognition period 2 years 7 months 9 days  
Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Unrecognized compensation costs, unvested stock option recognition period 2 years 1 month 17 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares outstanding, beginning of period (in shares) 962,446  
Granted (in shares) 690,508  
Vested (in shares) (251,505)  
Forfeited (in shares) (122,277)  
Shares outstanding, end of period (in shares) 1,279,172  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Shares outstanding, beginning of period (in dollars per shares) $ 6.57  
Granted (in dollars per shares) 2.71  
Vested (in dollars per shares) 7.70  
Forfeited (in dollars per shares) 7.66  
Shares outstanding, end of period (in dollars per shares) $ 4.16  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Unrecognized compensation costs $ 4,700  
Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Unrecognized compensation costs, unvested stock option recognition period 2 years 7 months 27 days  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Shares outstanding, beginning of period (in shares) 701,384  
Granted (in shares) 473,000  
Vested (in shares) 0  
Forfeited (in shares) (197,647)  
Shares outstanding, beginning of period (in shares) 976,737  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Shares outstanding, beginning of period (in dollars per share) $ 2.76  
Granted (in dollars per share) 1.90  
Vested (in dollars per share) 0.00  
Forfeited (in dollars per share) 6.88  
Shares outstanding, beginning of period (in dollars per share) $ 4.51  
Unrecognized compensation costs $ 1,500  
Phantom Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Unrecognized compensation costs, unvested stock option recognition period 3 years 9 months 14 days  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Shares outstanding, beginning of period (in shares) 0  
Granted (in shares) 781,645  
Vested (in shares) 0  
Forfeited (in shares) 0  
Shares outstanding, beginning of period (in shares) 781,645  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Shares outstanding, beginning of period (in dollars per share) $ 2.69  
Granted (in dollars per share) 2.69  
Vested (in dollars per share) 0.00  
Forfeited (in dollars per share) 0.00  
Shares outstanding, beginning of period (in dollars per share) $ 0.00  
Unrecognized compensation costs $ 1,200  
Cash Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Unrecognized compensation costs, unvested stock option recognition period 2 years 7 months 17 days  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]    
Shares outstanding, beginning of period (in shares) 0  
Granted (in shares) 512,127  
Vested (in shares) 0  
Forfeited (in shares) 0  
Shares outstanding, beginning of period (in shares) 512,127  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Shares outstanding, beginning of period (in dollars per share) $ 2.69  
Granted (in dollars per share) 2.69  
Vested (in dollars per share) 0.00  
Forfeited (in dollars per share) 0.00  
Shares outstanding, beginning of period (in dollars per share) $ 0.00  
Unrecognized compensation costs $ 800  
Minimum | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 0.00%  
Minimum | Cash Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 0.00%  
Maximum | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 100.00%  
Maximum | Cash Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 100.00%  
First anniversary, vesting percentage | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
First anniversary, vesting percentage | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
First anniversary, vesting percentage | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
First anniversary, vesting percentage | Phantom Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Second anniversary, vesting percentage | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Second anniversary, vesting percentage | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
Second anniversary, vesting percentage | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
Second anniversary, vesting percentage | Phantom Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Third anniversary, vesting percentage | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Third anniversary, vesting percentage | Stock Compensation Plan    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
Third anniversary, vesting percentage | Performance Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 33.33%  
Third anniversary, vesting percentage | Phantom Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Fourth anniversary, vesting percentage | Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%  
Fourth anniversary, vesting percentage | Phantom Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Grant Date Fair Value [Abstract]    
Vesting percentage 25.00%