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Debt - Schedule of Ratio of Net Indebtedness (Details) - 6 months ended Jun. 30, 2015
Total
Line Of Credit Facility Leverage Range [Line Items]  
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent) 50.00%
Less than 4.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Less than 4.00 to 1.00
Line of credit facility applicable margin rate 1.75%
Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00
Line of credit facility applicable margin rate 1.90%
Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00
Line of credit facility applicable margin rate 2.10%
Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00
Line of credit facility applicable margin rate 2.20%
Greater than or equal to 6.00 to 1.00 but less than 6.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Greater than or equal to 6.00 to 1.00 but less than 6.50 to 1.00
Line of credit facility applicable margin rate 2.50%
Greater than or equal to 6.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Line Of Credit Facility Leverage Rate Description Greater than or equal to 6.50 to 1.00
Line of credit facility applicable margin rate 2.75%
Minimum [Member]  
Line Of Credit Facility Leverage Range [Line Items]  
Line of credit facility, unused capacity, commitment fee (as a percent) 0.35%
Minimum [Member] | Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 4.00
Minimum [Member] | Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 5.00
Minimum [Member] | Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 5.50
Minimum [Member] | Greater than or equal to 6.00 to 1.00 but less than 6.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 6.00
Minimum [Member] | Greater than or equal to 6.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 6.50
Maximum [Member]  
Line Of Credit Facility Leverage Range [Line Items]  
Line of credit facility, unused capacity, commitment fee (as a percent) 0.25%
Maximum [Member] | Less than 4.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 4.00
Maximum [Member] | Greater than or equal to 4.00 to 1.00 but less than 5.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 5.00
Maximum [Member] | Greater than or equal to 5.00 to 1.00 but less than 5.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 5.50
Maximum [Member] | Greater than or equal to 5.50 to 1.00 but less than 6.00 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 6.00
Maximum [Member] | Greater than or equal to 6.00 to 1.00 but less than 6.50 to 1.00 [Member]  
Summary of leverage and applicable margin  
Ratio of net indebtedness to EBITDA (as a percent) 6.50