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Share-based compensation - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 10 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
General and administrative expense
Sep. 30, 2013
General and administrative expense
Sep. 30, 2014
General and administrative expense
Sep. 30, 2013
General and administrative expense
Aug. 20, 2013
Performance shares - conditions met
Management
Aug. 18, 2013
Performance shares - conditions met
Management
Sep. 30, 2014
Management and director options
Sep. 30, 2013
Management and director options
Sep. 30, 2014
Management and director options
Sep. 30, 2013
Management and director options
Sep. 30, 2014
Management and director options
Management
Sep. 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]
Sep. 30, 2014
Restricted share awards
Sep. 30, 2013
Restricted share awards
Sep. 30, 2014
Restricted share awards
Sep. 30, 2013
Restricted share awards
Dec. 31, 2013
Restricted share awards
Sep. 30, 2014
Restricted share awards
Director
Sep. 30, 2013
Restricted share awards
Director
Sep. 30, 2014
Restricted share awards
Director
Sep. 30, 2013
Restricted share awards
Director
Sep. 30, 2014
Restricted share awards
Employee [Member]
Sep. 30, 2013
Restricted share awards
Employee [Member]
Sep. 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)                                                                 10,215,455 10,613,975  
Share compensation expenses $ 2,481,000 $ 4,143,000 $ 6,979,000 $ 7,611,000     $ 2,500,000 $ 4,100,000 $ 7,000,000 $ 7,600,000     $ 1,700,000 $ 3,700,000 $ 5,100,000 $ 6,500,000           $ 800,000 $ 400,000 $ 1,800,000 $ 1,100,000                    
Unamortized share compensation expense 18,800,000   18,800,000   23,800,000                                                            
Unamortized share compensation expense, period of recognition     1 year 8 months 12 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) 11,269,911.000   11,269,911.000   10,981,075.000 10,956,838             11,269,911.000   11,269,911.000                                        
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 4 months 24 days 6 years 6 months                                                              
Aggregate intrinsic value of options outstanding 29,400,000   29,400,000   61,500,000                                                            
Aggregate intrinsic value of options exercisable $ 10,100,000   $ 10,100,000   $ 17,600,000                                                            
Restricted shares issued                                                     40,070 0 40,070 0 9,614 5,000