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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