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Debt - Senior Unsecured Term Loan (Details) - Senior Unsecured Term Loan
 12 Months Ended
May 03, 2016
USD ($)
Dec. 31, 2016
USD ($)
LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   145.00%
Interest incurred on the facility   $ 1,300,000
Less than or equal to 35% | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.45%
Greater than 35% but less than or equal to 45% | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.60%
Greater than 45% but less than or equal to 50% | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.75%
Greater than 50% but less than or equal to 55% | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   1.95%
Greater than 55% | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate   2.20%
Medium-term Notes    
Line Of Credit Facility Leverage Range [Line Items]    
Debt instrument, term (in years) 5 years  
Outstanding principal balance $ 100,000,000  
Minimum | Greater than 35% but less than or equal to 45%    
Summary of leverage and applicable margin    
Leverage Ratio   0.35
Minimum | Greater than 45% but less than or equal to 50%    
Summary of leverage and applicable margin    
Leverage Ratio   0.45
Minimum | Greater than 50% but less than or equal to 55%    
Summary of leverage and applicable margin    
Leverage Ratio   0.5
Minimum | Greater than 55%    
Summary of leverage and applicable margin    
Leverage Ratio   0.55
Minimum | Medium-term Notes | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate 145.00%  
Maximum | Less than or equal to 35%    
Summary of leverage and applicable margin    
Leverage Ratio   0.35
Maximum | Greater than 35% but less than or equal to 45%    
Summary of leverage and applicable margin    
Leverage Ratio   0.45
Maximum | Greater than 45% but less than or equal to 50%    
Summary of leverage and applicable margin    
Leverage Ratio   0.5
Maximum | Greater than 50% but less than or equal to 55%    
Summary of leverage and applicable margin    
Leverage Ratio   0.55
Maximum | Medium-term Notes | LIBOR    
Line Of Credit Facility Leverage Range [Line Items]    
Basis spread on variable rate 220.00%