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Share Capital - Textual (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2003
shares
Jun. 01, 2011
shares
Jun. 02, 2009
shares
May 30, 2008
shares
May 26, 2005
shares
Share Capital [Line Items]                
Compensation cost not yet recognized | $ $ 0              
Options, outstanding, intrinsic value | $ 27,000              
Options, exercises in period, intrinsic value | $ $ 471,000 $ 471,000 $ 0          
Options, outstanding, weighted average remaining contractual term 6 months              
Options, vested, weighted average remaining contractual term 6 months              
Reserved shares 2,753,496              
Stock Incentive Plan 2003                
Share Capital [Line Items]                
Vested percentage on date of grant       20.00%        
Vested percentage on each anniversary date       20.00%        
Vested percentage on each of first two years       20.00%        
Stock Incentive Plan Maxxcom Privatization [Member]                
Share Capital [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       802,440        
Employee Stock Incentive Plan                
Share Capital [Line Items]                
Proceeds from exercise of options | $ $ 0 $ 224,000 $ 0          
Employee Stock Option                
Share Capital [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0 0          
Employee Stock Option | Stock Incentive Plan 2005                
Share Capital [Line Items]                
Number of shares authorized           6,750,000   3,000,000
Employee Stock Option | Stock Incentive Plan 2005 | Additional Authorized On June 2007 And 2009                
Share Capital [Line Items]                
Number of shares authorized           3,750,000    
Employee Stock Option | Stock Incentive Plan 2003                
Share Capital [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       2,836,179        
Employee Stock Option | Stock Incentive Plan 2003 | Tranche 1                
Share Capital [Line Items]                
Expiration period (years)       5 years        
Employee Stock Option | Stock Incentive Plan 2003 | Tranche 2                
Share Capital [Line Items]                
Expiration period (years)       10 years        
Employee Stock Option | Key Partner Incentive Plan 2008                
Share Capital [Line Items]                
Number of shares authorized             900,000  
Employee Stock Option | Stock Incentive Plan 2011                
Share Capital [Line Items]                
Number of shares authorized         3,000,000      
Restricted Stock And Restricted Stock Units                
Share Capital [Line Items]                
Expiration period (years) 3 years              
Award vesting period (years) 3 years              
Equity instruments other than options, vested in period, fair value | $ $ 6,272,000 $ 5,394,000 $ 7,659,000          
Tax benefit from compensation expense | $ 5,429,000 $ 4,678,000 $ 11,874,000          
Restricted stock and restricted unit awards, fair value | $ 5,441,000              
Nonvested awards, compensation not yet recognized, share-based awards other than options | $ $ 7,105,000              
Number of shares available for grant (in shares) 1,934,861              
Stock Appreciation Rights (SARs)                
Share Capital [Line Items]                
Number of shares available for grant (in shares) 781,135              
Time Based Awards | Employee Stock Option                
Share Capital [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 380,367 297,794 264,478          
Time Based Awards | Restricted Stock And Restricted Stock Units                
Share Capital [Line Items]                
Equity instruments other than options, outstanding, weighted average remaining contractual terms 1 year 7 months 24 days              
Performance Shares | Employee Stock Option                
Share Capital [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 17,963 68,067 497,214          
Performance Shares | Restricted Stock And Restricted Stock Units                
Share Capital [Line Items]                
Equity instruments other than options, outstanding, weighted average remaining contractual terms 1 year 10 months 13 days              
Common Class A                
Share Capital [Line Items]                
Number of votes per share 1              
Common Class B                
Share Capital [Line Items]                
Number of votes per share 20