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Debt - Schedule of Ratio of Net Indebtedness (Details) - Line of Credit
 12 Months Ended
Dec. 31, 2017
Less than or equal to 35% | Maximum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.35
Greater than 35% but less than or equal to 45% | Minimum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.35
Greater than 35% but less than or equal to 45% | Maximum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.45
Greater than 45% but less than or equal to 50% | Minimum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.45
Greater than 45% but less than or equal to 50% | Maximum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.5
Greater than 50% but less than or equal to 55% | Minimum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.5
Greater than 50% but less than or equal to 55% | Maximum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.55
Greater than 55% | Minimum  
Line Of Credit Facility Leverage Range [Line Items]  
Leverage Ratio 0.55
LIBOR  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 1.50%
LIBOR | Less than or equal to 35%  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 1.50%
LIBOR | Greater than 35% but less than or equal to 45%  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 1.65%
LIBOR | Greater than 45% but less than or equal to 50%  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 1.80%
LIBOR | Greater than 50% but less than or equal to 55%  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 2.00%
LIBOR | Greater than 55%  
Line Of Credit Facility Leverage Range [Line Items]  
Applicable Margin 2.25%