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Share-Based Payments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Expense recognized associated with the issuance of rights to receive cash $ 3,320   $ 3,079 $ 7,261 $ 6,844
ecoATM          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Expense recognized associated with the issuance of rights to receive cash       $ 2,900  
Share-based compensation - restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       277,000  
Expense recognized associated with the issuance of rights to receive cash 2,039   3,443 $ 4,598 6,357
Share-based compensation - stock options          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Expense recognized associated with the issuance of rights to receive cash $ 40   $ 223 $ 181 $ 456
Paramount          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1]   50,000   350,000  
Awards Granted To Employees And Executives | Share-based compensation - restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Share-based payment award vesting period, years 4 years        
Awards Granted To Non Employee Directors | Share-based compensation - restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Share-based payment award vesting period, years 1 year        
Performance-based Restricted Stock Awards Granted to Executives          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Percentage of restricted stock awards vests two years from the date of grant 65.00%     65.00%  
Percentage of the restricted stock award vests three years from the date of grant 35.00%     35.00%  
Performance-based Restricted Stock Awards Granted to Executives | Share-based compensation - restricted stock          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Share-based payment award vesting period, years 3 years        
[1] Includes 95,000 shares that vested on January 1, 2015.