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Equity - Class of Stock Disclosures (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 01, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Aug. 05, 2015
Jul. 01, 2015
Dec. 31, 2014
Equity                
Preferred shares outstanding   2,000,000   2,000,000       2,000,000
Dividend Distributions                
Declared   $ 56,842,000 $ 55,729,000 $ 56,842,000 $ 55,729,000      
Paid       $ 56,842,000 $ 55,729,000      
Dividends declared and paid per common share per month (in dollars per share)         $ 0.17      
Dividends declared and paid per common share (in dollars per share)   $ 0.51 $ 0.51 $ 1.53 $ 1.53      
Accumulated other comprehensive income                
Accumulated other comprehensive income   $ 56,000   $ 56,000       $ 82,000
Dividend Declared                
Dividend Distributions                
Cash dividend declared per common share per month (in dollars per share)             $ 0.17  
Subsequent Event | Dividend Declared                
Dividend Distributions                
Per share percentage increase in dividends declared 5.90%              
Cash dividend declared per common share per month (in dollars per share) $ 0.18              
Shelf Registration                
Equity                
Maximum offering capacity under shelf registration statement   800,000,000   800,000,000        
Amount available under effective shelf registration statement   $ 575,100,000   $ 575,100,000        
Series C Preferred Stock                
Equity                
Preferred shares outstanding   2,000,000   2,000,000        
Dividend Rate (as a percent)       8.50%        
Number of shares of common stock to be issued upon conversion       2,000,000        
Conversion price per share       $ 19.25        
Total shares reserved for issuance of common stock related to the conversion of preferred stock   2,000,000   2,000,000        
Dividend Distributions                
Declared   $ 2,454,000 $ 2,454,000 $ 2,454,000 $ 2,454,000      
Paid       $ 2,454,000 $ 2,454,000      
Common Stock                
Equity                
Number of shares repurchased       4,609 200      
Dividend Distributions                
Declared   $ 54,388,000 $ 53,275,000 $ 54,388,000 $ 53,275,000      
Paid       $ 54,388,000 $ 53,275,000      
Common Stock | Equity Distribution Agreement                
Equity                
Maximum offering capacity under shelf registration statement           $ 200,000,000    
Amount available under effective shelf registration statement           $ 200,000,000