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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 23, 2017
Dec. 09, 2016
Nov. 02, 2016
Aug. 04, 2016
May 09, 2016
Feb. 25, 2016
Nov. 05, 2015
Aug. 04, 2015
May 05, 2015
Apr. 20, 2015
Feb. 25, 2015
Nov. 05, 2014
Aug. 06, 2014
May 06, 2014
Apr. 11, 2014
Feb. 24, 2014
Jan. 31, 2014
Sep. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 31, 2016
May 31, 2014
Stockholders' Equity                                              
Dividend declared (in dollars per share)     $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48 $ 0.48   $ 0.48 $ 0.48 $ 0.48 $ 0.48   $ 0.48     $ 1.92 $ 1.92 $ 1.92    
Shares issued   20,470,000               13,800,000         25,300,000                
Gross proceeds from issuance of common stock   $ 448,825               $ 326,142         $ 564,695       $ 449,230 $ 326,428 $ 600,998    
Value of shares that may be issued under the ATM Agreement                                             $ 500,000
Authorized amount of share repurchases                                   $ 250,000       $ 500,000  
Period for repurchase of common stock                                   1 year          
Common stock repurchased (in shares)                                     1,052,889 2,340,246 587,900    
Cost of common stock repurchased                                     $ 19,723 $ 48,746 $ 12,993    
Remaining capacity under repurchase program                                     $ 262,200        
Price per share   $ 21.93               $ 23.63         $ 22.32                
Number of shares that may be issued under the DRIP Plan                                     11,000,000        
Shares issued under ATM Agreement                                     0 0      
Proceeds from ATM Agreement                                         36,172    
Underwriting and offering costs                                     $ 778 $ 945 $ 1,535    
Subsequent Events                                              
Stockholders' Equity                                              
Dividend declared (in dollars per share) $ 0.48                                            
Common stock                                              
Stockholders' Equity                                              
Shares issued                                     20,470,000 13,800,000 25,300,000    
Shares issued under ATM Agreement                                         1,512,925    
Proceeds from ATM Agreement                                         $ 16    
Convertible Senior Notes                                              
Stockholders' Equity                                              
Face amount of debt repurchased                                         0    
Debt repurchased amount                                         $ 0    
SWAY                                              
Stockholders' Equity                                              
Shares issued                                 40,100,000            
2019 Notes                                              
Stockholders' Equity                                              
Face amount of debt repurchased                                     $ 19,400 $ 118,600      
Debt repurchased amount                                     $ 19,900 $ 136,300