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Share-based compensation - Narrative (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 10 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
General and administrative expense
Jun. 30, 2013
General and administrative expense
Jun. 30, 2014
General and administrative expense
Jun. 30, 2013
General and administrative expense
Aug. 20, 2013
Performance shares - conditions met
Management
Aug. 18, 2013
Performance shares - conditions met
Management
Jun. 30, 2014
Management and director options
Jun. 30, 2013
Management and director options
Jun. 30, 2014
Management and director options
Jun. 30, 2013
Management and director options
Jun. 30, 2014
Management and director options
Management
Jun. 30, 2014
Management and director options
Director
Nov. 04, 2013
Management and director options
Director
Previous Vesting on Five Anniversary Dates [Member]
Nov. 06, 2013
Management and director options
Director
Fully Vested on November 6th, 2013 [Member]
Nov. 06, 2013
Management and director options
Director
Forfeited on November 6, 2013 [Member]
Jun. 30, 2014
Restricted share awards
Jun. 30, 2013
Restricted share awards
Jun. 30, 2014
Restricted share awards
Jun. 30, 2013
Restricted share awards
Dec. 31, 2013
Restricted share awards
Jun. 30, 2014
Restricted share awards
Employee [Member]
Jun. 30, 2013
Restricted share awards
Employee [Member]
Jun. 30, 2014
Restricted share awards
Employee [Member]
Jun. 30, 2013
Restricted share awards
Employee [Member]
Jun. 30, 2014
Omnibus plan
Dec. 31, 2013
Omnibus plan
Jul. 15, 2013
Omnibus plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                  
Number of shares authorized (in shares)                                                                 21,627,906
Number of shares available for future issuance (in shares)                                                             10,255,525 10,613,975  
Share compensation expenses $ 2,246,000 $ 1,716,000 $ 4,498,000 $ 3,468,000     $ 2,200,000 $ 1,700,000 $ 4,500,000 $ 3,500,000     $ 1,700,000 $ 1,500,000 $ 3,400,000 $ 2,800,000           $ 500,000 $ 200,000 $ 1,100,000 $ 700,000                
Unamortized share compensation expense 20,700,000   20,700,000   23,800,000                                                        
Unamortized share compensation expense, period of recognition     1 year 9 months 18 days   2 years                                                        
Service condition met on each of first five anniversary dates following grant date                                 20.00%   20.00% 60.00% 40.00%                        
Award vesting period                                 5 years 5 years           3 years   2 years              
Options outstanding had met the performance condition (in shares)                     2,357,633 8,572,594                                          
Options outstanding (in shares) 11,329,911.000   11,329,911.000   10,981,075.000 10,956,838             11,329,911.000   11,329,911.000                                    
Fair value assumptions                                                                  
Estimated share price (in dollars per share) $ 15.05 $ 10.89 $ 15.05 $ 10.89                                                          
Volatility assumption     23.10% 22.00%                                                          
Risk free interest rate     2.20% 1.20%                                                          
Expected life     6 years 6 months 6 years 6 months                                                          
Dividend yield     0.00% 0.00%                                                          
Remaining contractual life     7 years 7 months 6 days 8 years 1 month 6 days                                                          
Aggregate intrinsic value of options outstanding 34,500,000   34,500,000   61,500,000                                                        
Aggregate intrinsic value of options exercisable $ 12,300,000   $ 12,300,000   $ 17,600,000                                                        
Restricted shares issued                                                     6,489 0 9,614 5,000