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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ (28,400) |  |
Restructuring reserve, reclass to equity, decrease |  | $ 2,283 |  |
Common shares issued for ESPP (in shares) |  | 20,291 |  |
ESPP expense |  | $ 198 | $ 0 | $ 0
LTIP | Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted average grant date fair value |  | 14,600 | 3,100 | 74,100
Unamortized stock compensation expense |  | $ 15,100 |  |
Compensation cost not yet recognized, period for recognition (years) |  | 1 year 3 months 13 days |  |
LTIP | Restricted Stock Units (RSUs) | General and Administrative Expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ (26,100) | $ (38,400) | $ (7,200)
LTIP | Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award requisite service period (years) |  | 10 years |  |
Common stock, reserved for future issuance |  | 20,000,000 |  |
Common stock, shares available for future issuance |  | 16,038,580 |  |
LTIP | Minimum | Restricted Stock Units (RSUs) | Primary Vesting Category |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting |  | 2 years |  |
LTIP | Maximum | Restricted Stock Units (RSUs) | Primary Vesting Category |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting |  | 3 years |  |
Employee Stock Purchase Plan | ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, shares available for future issuance |  | 2,951,255 |  |
Employee Stock Purchase Plan | Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, reserved for future issuance |  | 3,000,000 |  |
Fair market value at grant purchase price, percentage |  | 85.00% |  |
Fair market value at grant exercise price, percentage |  | 85.00% |  |
Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares issued for ESPP (in shares) | 28,454 |  |  |
U.S. Services |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restructuring reserve, reclass to equity, decrease |  | $ 2,283 |  |
U.S. Services | LTIP | Restricted Stock Units (RSUs) | Restructuring Charges [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restructuring reserve, reclass to equity, decrease |  | $ 2,300 |  |

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