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Debt and Credit Agreements - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
fiscal_period
Apr. 17, 2015
USD ($)
May 31, 2016
USD ($)
Sep. 30, 2014
USD ($)
Investor
Tranche
Dec. 31, 2010
USD ($)
Investor
Tranche
Dec. 31, 2008
USD ($)
Investor
Jul. 31, 2008
USD ($)
Investor
Tranche
Jul. 31, 2001
USD ($)
Investor
Tranche
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
fiscal_period
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 19, 2016
USD ($)
Apr. 18, 2016
USD ($)
Debt Instrument [Line Items]                            
2018                   $ 304,000,000        
2020                   87,000,000        
2021                   188,000,000        
Repayments of debt                   587,000,000 $ 604,000,000 $ 1,427,000,000    
Loss on repurchase of debt                   4,709,000 0 $ 0    
Deferred financing costs capitalized $ 8,861,000                 7,470,000 8,861,000      
Long-term debt including unamortized debt issuance costs $ 2,025,000,000                 $ 1,528,000,000 $ 2,025,000,000      
7.33% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent) 7.33%                 7.33% 7.33%      
Long-term debt including unamortized debt issuance costs $ 20,000,000                 $ 0 $ 20,000,000      
6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent) 6.51%                 6.51% 6.51%      
Long-term debt including unamortized debt issuance costs $ 425,000,000                 $ 361,000,000 $ 425,000,000      
9.78% senior notes                            
Debt Instrument [Line Items]                            
Interest rate (as a percent) 9.78%                 9.78% 9.78%      
Long-term debt including unamortized debt issuance costs $ 67,000,000                 $ 67,000,000 $ 67,000,000      
5.58% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent) 5.58%                 5.58% 5.58%      
Long-term debt including unamortized debt issuance costs $ 175,000,000                 $ 175,000,000 $ 175,000,000      
3.65% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent) 3.65%                 3.65% 3.65%      
Long-term debt including unamortized debt issuance costs $ 925,000,000                 $ 925,000,000 $ 925,000,000      
Revolving credit facility                            
Debt Instrument [Line Items]                            
Remaining borrowing capacity on line of credit                   $ 1,700,000,000        
Minimum required asset coverage ratio                   1.75        
Fiscal quarters for reduction in coverage ratio | fiscal_period                   4        
Minimum required annual coverage ratio                   2.8        
Maximum borrowing capacity on line of credit                         $ 3,200,000,000.0 $ 3,400,000,000.0
Available line of credit   $ 1,800,000,000                        
Minimum current ratio                   1.0        
Debt issuance costs 1,100,000 $ 7,800,000                 1,100,000      
Long-term debt including unamortized debt issuance costs $ 413,000,000                 $ 0 $ 413,000,000      
Interest rate during period                   2.30% 2.20% 2.20%    
Senior Notes                            
Debt Instrument [Line Items]                            
Minimum required asset coverage ratio 1.75                          
Fiscal quarters for reduction in coverage ratio | fiscal_period                   4        
Minimum required annual coverage ratio                   2.8        
Deferred financing costs capitalized                   $ 1,900,000        
Senior Notes | 7.33% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent)                   7.33%        
Principal               $ 170,000,000            
Number of institutional investors | Investor               7            
Number of debt tranches | Tranche               3            
Principal repaid                   $ 170,000,000        
Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal             $ 425,000,000              
Number of institutional investors | Investor             41              
Number of debt tranches | Tranche             3              
Senior Notes | 9.78% senior notes                            
Debt Instrument [Line Items]                            
Principal           $ 67,000,000                
Number of institutional investors | Investor           4                
Term           10 years                
Interest rate (as a percent)           9.78%                
Senior Notes | 5.58% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal         $ 175,000,000                  
Number of institutional investors | Investor         8                  
Number of debt tranches | Tranche         3                  
Senior Notes | 3.65% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Weighted-average interest rate (as a percent)       3.65%                    
Deferred financing costs capitalized       $ 5,600,000                    
Principal       $ 925,000,000                    
Number of institutional investors | Investor       24                    
Number of debt tranches | Tranche       3                    
Revolving credit facility                            
Debt Instrument [Line Items]                            
Remaining borrowing capacity on line of credit                         $ 1,600,000,000  
Minimum required asset coverage ratio 1.75                          
Minimum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Unused capacity fee percentage   0.30%                        
Maximum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Unused capacity fee percentage   0.50%                        
December 31, 2016 | Senior Notes                            
Debt Instrument [Line Items]                            
Maximum leverage coverage ratio 4.75                          
December 31, 2016 | Revolving credit facility                            
Debt Instrument [Line Items]                            
Maximum leverage coverage ratio 4.75                          
December 31, 2017 | Senior Notes                            
Debt Instrument [Line Items]                            
Minimum required asset coverage ratio 1.25                          
Maximum leverage coverage ratio 4.25                          
December 31, 2017 | Revolving credit facility                            
Debt Instrument [Line Items]                            
Minimum required asset coverage ratio 1.25                          
Maximum leverage coverage ratio 4.25                          
March 31, 2018 | Senior Notes                            
Debt Instrument [Line Items]                            
Minimum required asset coverage ratio 1.75                          
Maximum leverage coverage ratio 3.50                          
March 31, 2018 | Revolving credit facility                            
Debt Instrument [Line Items]                            
Minimum required asset coverage ratio 1.75                          
Maximum leverage coverage ratio 3.50                          
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's | Senior Notes                            
Debt Instrument [Line Items]                            
Maximum leverage coverage ratio 3.0                          
Fiscal quarters for reduction in coverage ratio | fiscal_period 2                          
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's | Revolving credit facility                            
Debt Instrument [Line Items]                            
Maximum leverage coverage ratio 3.0                 3.0        
Fiscal quarters for reduction in coverage ratio | fiscal_period 2                 2        
Increase in rate based upon coverage and leverage ratio | Senior Notes                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   0.00%        
Increase in rate based upon coverage and leverage ratio | Minimum | Senior Notes                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   0.00%        
Increase in rate based upon coverage and leverage ratio | Maximum | Senior Notes                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   1.25%        
Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Amount of principal repurchased     $ 64,000,000                      
Repayments of debt     68,300,000                      
Loss on repurchase of debt                 $ 4,700,000          
Tranche 1 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal             $ 245,000,000              
Term             10 years              
Interest rate (as a percent)             6.44%              
Tranche 1 | Senior Notes | 5.58% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal         $ 88,000,000                  
Term         10 years                  
Interest rate (as a percent)         5.42%                  
Tranche 1 | Senior Notes | 3.65% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal       $ 100,000,000                    
Term       7 years                    
Interest rate (as a percent)       3.24%                    
Tranche 1 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Amount of principal repurchased     8,000,000                      
Tranche 2 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal             $ 100,000,000              
Term             12 years              
Interest rate (as a percent)             6.54%              
Tranche 2 | Senior Notes | 5.58% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal         $ 25,000,000                  
Term         12 years                  
Interest rate (as a percent)         5.59%                  
Tranche 2 | Senior Notes | 3.65% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal       $ 575,000,000                    
Term       10 years                    
Interest rate (as a percent)       3.67%                    
Tranche 2 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Amount of principal repurchased     13,000,000                      
Tranche 3 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal             $ 80,000,000              
Term             15 years              
Interest rate (as a percent)             6.69%              
Tranche 3 | Senior Notes | 5.58% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal         $ 62,000,000                  
Term         15 years                  
Interest rate (as a percent)         5.80%                  
Tranche 3 | Senior Notes | 3.65% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Principal       $ 250,000,000                    
Term       12 years                    
Interest rate (as a percent)       3.77%                    
Tranche 3 | Senior Notes | 6.51% weighted-average senior notes                            
Debt Instrument [Line Items]                            
Amount of principal repurchased     $ 43,000,000                      
LIBOR | Minimum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   0.50%        
LIBOR | Maximum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   3.00%        
LIBOR | Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's | Minimum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   0.50%        
LIBOR | Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's | Maximum | Revolving credit facility                            
Debt Instrument [Line Items]                            
Basis spread on variable rate                   2.25%