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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 |  |

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