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Share-Based Compensation (Summary of Plan Activity) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stock Option [Member] | 2011 Equity Incentive Plan [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Number of units outstanding, beginning balance (in shares) 776,475 2,025,894 2,550,835
Forfeited, (in shares)   (80,734) (141,130)
Expired (in shares) (141,986) (51,305) (383,811)
Modification (in shares)   (1,117,380)  
Number of units outstanding, ending balance (in shares) 634,489 776,475 2,025,894
Number of units exercisable, ending balance (in shares) 540,331    
Weighted-average strike price      
Outstanding, Weighted-average grant-date fair value, beginning balance (in dollars per share) $ 15.55 $ 21.03 $ 17.62
Forfeitures, Weighted-average grant-date fair value, (in dollars per share)   10.30 16.54
Expired, Weighted-average grant-date fair value (in dollars per share) 21.20 14.05 20.01
Modification, Weighted-average grant-date fair value (in dollars per share)   19.07  
Outstanding, Weighted-average grant-date fair value, ending balance (in dollars per share) 14.28 15.55 21.03
Exercisable, Weighted-average grant-date fair value (in dollars per share) 15.03    
Weighted-average grant-date fair value      
Outstanding at beginning of period, Weighted-average grant date fair value, (in dollars per share) 4.46 5.87 4.94
Forfeitures, Weighted-average fair value (in dollars per share)   2.68 5.02
Expired, Weighted-average grant date fair value, (in dollars per share) 5.28 4.02 5.41
Modification, Weighted-average grant date fair value (in dollars per share)   5.30  
Outstanding at end of period, Weighted-average grant date fair value, (in dollars per share) 4.28 $ 4.46 $ 5.87
Exercisable, Weighted-average grant date fair value, (in dollars per share) $ 4.58    
Restricted Share Units [Member] | 2011 Equity Incentive Plan [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Number of units outstanding, beginning balance (in shares) 1,780,997 1,230,210 862,855
Annual grant (in shares) 497,960 865,291 923,213
Vested, (in shares)   (27,075) (222,781)
Forfeited, (in shares) (180,828) (142,176) (233,005)
Number of units outstanding, ending balance (in shares) 1,736,845 1,780,997 1,230,210
Number of units exercisable, ending balance (in shares) 0    
Weighted-average strike price      
Outstanding, Weighted-average grant-date fair value, beginning balance (in dollars per share) $ 6.07 $ 7.96 $ 14.38
Annual grant, Weighted-average grant-date fair value (in dollars per share) 9.20 4.70 6.33
Vested, Weighted-average grant-date fair value (in dollars per share)   21.20 21.20
Forfeitures, Weighted-average grant-date fair value, (in dollars per share) 5.99 6.64 9.88
Outstanding, Weighted-average grant-date fair value, ending balance (in dollars per share) 6.65 $ 6.07 $ 7.96
Exercisable, Weighted-average grant-date fair value (in dollars per share) $ 0.00    
Restricted Share Units [Member] | 2012 Equity Incentive Plan [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Vested, (in shares) (23,003) (24,653) (31,772)
Weighted-average strike price      
Vested, Weighted-average grant-date fair value (in dollars per share) $ 14.35 $ 14.35 $ 14.35
Restricted Share Units [Member] | 2013 Equity Incentive Plan [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Vested, (in shares) (24,073) (26,054) (68,300)
Weighted-average strike price      
Vested, Weighted-average grant-date fair value (in dollars per share) $ 14.31 $ 14.31 $ 14.31
Restricted Share Units [Member] | 2014 Equity Incentive Plan [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Vested, (in shares) (44,312) (94,546)  
Weighted-average strike price      
Vested, Weighted-average grant-date fair value (in dollars per share) $ 8.58 $ 8.58  
Restricted Share Units [Member] | 2011 Equity Incentive Plan - 2015 Grants [Member]      
Restricted Stock Unit Activity [Roll Forward]      
Vested, (in shares) (269,896)    
Weighted-average strike price      
Vested, Weighted-average grant-date fair value (in dollars per share) $ 6.33