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Stockholders' Equity and Stock Incentive Plans (Restricted Stock Units, Performance Stock Units and Career Shares) (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2012
Restricted Stock Units (RSUs)
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Dec. 31, 2011
Restricted Stock Units (RSUs)
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Dec. 31, 2010
Restricted Stock Units (RSUs)
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Dec. 31, 2012
Performance Stock Units (PSUs)
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Dec. 31, 2011
Performance Stock Units (PSUs)
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Dec. 31, 2010
Performance Stock Units (PSUs)
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Dec. 31, 2012
Career Shares
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Dec. 31, 2011
Career Shares
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Dec. 31, 2010
Career Shares
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May 31, 2012
Director
Restricted Stock Units (RSUs)
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Dec. 31, 2011
Director
Restricted Stock Units (RSUs)
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Dec. 31, 2010
Director
Restricted Stock Units (RSUs)
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Dec. 31, 2012
Executive Officer
Career Shares
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||
| Share-based compensation expense | $ 12,247,000 | $ 9,996,000 | $ 11,324,000 | $ 5,816,000 | $ 3,062,000 | $ 1,759,000 | $ 729,000 | $ 76,000 | $ 0 | $ 1,068,000 | $ 2,008,000 | $ 461,000 | ||||
| Non-Option Award Activity [Roll Forward] | ||||||||||||||||
| Outstanding, beginning of period | 1,849,390 | 1,436,095 | 970,108 | 406,602 | 0 | 539,689 | 432,862 | 304,441 | ||||||||
| Granted | 860,376 | 765,516 | 485,067 | 423,955 | 406,602 | 163,137 | 113,495 | 146,622 | 751,000 | 695,000 | 429,000 | |||||
| Canceled | (9,781) | (41,340) | (19,080) | (1,427) | 0 | 0 | (6,668) | (18,201) | ||||||||
| Vested / awarded | (328,838) | (310,881) | 0 | 0 | 0 | 0 | 0 | 0 | ||||||||
| Outstanding, end of period | 2,371,147 | 1,849,390 | 1,436,095 | 829,130 | 406,602 | 0 | 702,826 | 539,689 | 432,862 | |||||||
| Outstanding, vested | 955,693 | 573,798 | 0 | 0 | 441,736 | 314,888 | ||||||||||
| Granted, weighted average grant date fair value (in USD per share) | $ 5.51 | $ 6.96 | $ 8.36 | $ 5.24 | $ 6.70 | $ 7.69 | $ 10.81 | $ 8.60 | ||||||||
| Total unrecognized share-based compensation costs related to unvested stock options | $ 0 | $ 6,800,000 | ||||||||||||||
| Total unrecognized share-based compensation costs related to unvested stock options, period for recognition | 2 years | 2 years 6 months | ||||||||||||||
| Evaluation of performance conditions, period | 3 years | |||||||||||||||
| Awards if no conditions met, percentage | 0.00% | |||||||||||||||
| Awards if only threshhold performance met, percentage | 50.00% | |||||||||||||||
| Awards for target performance, percentage | 100.00% | |||||||||||||||
| Awards for maximum performance, percentage (up to 200%) | 200.00% | |||||||||||||||
| Award vesting period | 3 years | |||||||||||||||
| Award eligibility, minimum age | 55 years | |||||||||||||||
| Award requisite service period | 10 years | |||||||||||||||
| Service period, Tranche 1 | 10 years | |||||||||||||||
| Service period, Tranche 2 | 15 years | |||||||||||||||
| Service period, Tranche 3 | 20 years | |||||||||||||||