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Share-Based Compensation (Summary of Plan Activity) (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Option [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |
Restricted Stock Unit Activity [Roll Forward] |  |  |  |
Number of units outstanding, beginning balance (in shares) |  | 2,025,894 | 2,550,835 | 2,433,888
Granted, (in shares) |  |  |  | 247,475
Forfeited, (in shares) |  | (80,734) | (141,130) | (130,528)
Expired (in shares) |  | (51,305) | (383,811) |
Modification (in shares) |  | (1,117,380) |  |
Number of units outstanding, ending balance (in shares) | 776,475 | 776,475 | 2,025,894 | 2,550,835
Number of units exercisable, ending balance (in shares) | 584,103 | 584,103 |  |
Weighted-average strike price |  |  |  |
Outstanding, Weighted-average base value, beginning balance (in dollars per share) |  | $ 21.03 | $ 17.62 | $ 18.57
Granted, Weighted-average base value (in dollars per share) |  |  |  | 8.58
Forfeitures, Weighted-average fair value, (in dollars per share) |  | 10.30 | 16.54 | 18.14
Expired, Weighted-average fair value (in dollars per share) |  | 14.05 | 20.01 |
Modification, Weighted-average strike price (in dollars per share) |  | 19.07 |  |
Outstanding, Weighted-average base value, ending balance (in dollars per share) | $ 15.55 | 15.55 | 21.03 | 17.62
Exercisable, Weighted-average base value (in dollars per share) | 16.99 | 16.99 |  |
Weighted-average grant-date fair value |  |  |  |
Outstanding at beginning of period, Weighted-average grant date fair value, (in dollars per share) |  | 5.87 | 4.94 | 5.26
Annual grant, Weighted-average grant date fair value, (in dollars per share) |  |  |  | 1.98
Forfeitures, Weighted-average fair value (in dollars per share) |  | 2.68 | 5.02 | 5.27
Expired, Weighted-average grant date fair value, (in dollars per share) |  | 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) | 4.46 | 4.46 | $ 5.87 | $ 4.94
Exercisable, Weighted-average grant date fair value, (in dollars per share) | $ 4.88 | $ 4.88 |  |
Stock Option [Member] | 2011 Equity Incentive Plan Award Modification [Member] |  |  |  |
Restricted Stock Unit Activity [Roll Forward] |  |  |  |
Number of units outstanding, beginning balance (in shares) | 1,117,380 |  |  |
Forfeited, (in shares) | (10,020) |  |  |
Expired (in shares) | (173,961) |  |  |
Number of units outstanding, ending balance (in shares) | 933,399 | 933,399 |  |
Number of units exercisable, ending balance (in shares) | 842,986 | 842,986 |  |
Weighted-average strike price |  |  |  |
Outstanding, Weighted-average base value, beginning balance (in dollars per share) | $ 19.07 |  |  |
Forfeitures, Weighted-average fair value, (in dollars per share) | 14.33 |  |  |
Expired, Weighted-average fair value (in dollars per share) | 20.14 |  |  |
Outstanding, Weighted-average base value, ending balance (in dollars per share) | 18.92 | $ 18.92 |  |
Exercisable, Weighted-average base value (in dollars per share) | 19.41 | 19.41 |  |
Weighted-average grant-date fair value |  |  |  |
Outstanding at beginning of period, Weighted-average grant date fair value, (in dollars per share) | 0.01 |  |  |
Outstanding at end of period, Weighted-average grant date fair value, (in dollars per share) | 0.01 | 0.01 |  |
Exercisable, Weighted-average grant date fair value, (in dollars per share) | $ 0.01 | $ 0.01 |  |
Restricted Share Units [Member] | 2011 Equity Incentive Plan [Member] |  |  |  |
Restricted Stock Unit Activity [Roll Forward] |  |  |  |
Number of units outstanding, beginning balance (in shares) |  | 1,230,210 | 862,855 | 942,068
Granted, (in shares) |  | 865,291 | 923,213 | 317,351
Vested, (in shares) |  | (27,075) | (222,781) | (274,314)
Forfeited, (in shares) |  | (142,176) | (233,005) | (47,947)
Number of units outstanding, ending balance (in shares) | 1,780,997 | 1,780,997 | 1,230,210 | 862,855
Number of units exercisable, ending balance (in shares) | 0 | 0 |  |
Weighted-average strike price |  |  |  |
Outstanding, Weighted-average base value, beginning balance (in dollars per share) |  | $ 7.96 | $ 14.38 | $ 18.36
Granted, Weighted-average base value (in dollars per share) |  | 4.70 | 6.33 | 8.58
Vested, Weighted-average fair value (in dollars per share) |  | 21.20 | 21.20 | 21.20
Forfeitures, Weighted-average fair value, (in dollars per share) |  | 6.64 | 9.88 | 15.11
Outstanding, Weighted-average base value, ending balance (in dollars per share) | $ 6.07 | 6.07 | $ 7.96 | $ 14.38
Exercisable, Weighted-average base value (in dollars per share) | $ 0.00 | $ 0.00 |  |
Restricted Share Units [Member] | 2012 Equity Incentive Plan [Member] |  |  |  |
Restricted Stock Unit Activity [Roll Forward] |  |  |  |
Vested, (in shares) |  | (24,653) | (31,772) | (74,303)
Weighted-average strike price |  |  |  |
Vested, Weighted-average 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) |  | (26,054) | (68,300) |
Weighted-average strike price |  |  |  |
Vested, Weighted-average fair value (in dollars per share) |  | $ 14.31 | $ 14.31 |
Restricted Share Units [Member] | 2014 Equity Incentive Plan [Member] |  |  |  |
Restricted Stock Unit Activity [Roll Forward] |  |  |  |
Vested, (in shares) |  | (94,546) |  |
Weighted-average strike price |  |  |  |
Vested, Weighted-average fair value (in dollars per share) |  | $ 8.58 |  |

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