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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restricted stock awards [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 1,698,000 | 1,662,000 | 1,328,000 |
Vested (in shares) |  |  |  |  | (1,275,000) | (1,185,000) | (1,455,000) |
Cancelled or forfeited (in shares) |  |  |  |  | (521,000) | (298,000) | (452,000) |
Ending balance (in shares) | 3,454,000 |  |  |  | 3,454,000 | 3,552,000 | 3,373,000 | 3,952,000
Weighted Average Grant Date Fair Value [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance (in dollars per share) |  |  |  | $ 25.70 | $ 25.70 | $ 21.12 | $ 16.67 |
Granted (in dollars per share) |  |  |  |  | 32.75 | 29.79 | 26.98 |
Vested (in dollars per share) |  |  |  |  | 23.55 | 19.58 | 15.08 |
Cancelled/forfeited (in dollars per share) |  |  |  |  | 18.68 | 21.02 | 18.87 |
Ending balance (in dollars per share) | $ 28.80 |  |  |  | $ 28.80 | $ 25.70 | $ 21.12 |
Unrecognized compensation cost related to nonvested share-based compensation arrangements granted | $ 63,800 |  |  |  | $ 63,800 |  |  |
Period over which cost is expected to be recognized |  |  |  |  | 2 years 3 months 18 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares granted (in shares) |  |  |  |  | 1,698,000 | 1,662,000 | 1,328,000 |
Percentage of estimated forfeitures, minimum |  |  |  |  | 0.00% |  |  |
Percentage of estimated forfeitures, maximum |  |  |  |  | 20.00% |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |
Restricted stock awards [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) | 244,000 | 49,000 | 70,000 | 1,335,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Restricted shares granted (in shares) | 244,000 | 49,000 | 70,000 | 1,335,000 |  |  |  |
Value per share minimum (in dollars per share) | $ 21.82 | $ 33.02 | $ 36.12 | $ 34.57 |  |  |  |
Value per share maximum (in dollars per share) | $ 21.82 | $ 33.02 | $ 36.12 | $ 34.89 |  |  |  |
Total value of restricted shares granted | $ 5,327 | $ 1,611 | $ 2,540 | $ 46,142 |  |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage payroll deduction that each employee may deduct |  |  |  |  | 15.00% |  |  |
Percentage of closing market price paid for purchase of whole shares |  |  |  |  | 90.00% |  |  |
Number of shares reserved (in shares) | 1,800,000 |  |  |  | 1,800,000 |  |  |

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