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Debt - Lines of Credit (Details) - Jun. 30, 2015 - Lines of credit
USD ($)
Credit Facilities  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity $ 150,000,000.0
Letters of credit, amount outstanding $ 6,300,000
Credit Facilities | Minimum  
Line of Credit Facility [Line Items]  
Commitment fee percentage 0.25%
Credit Facilities | Maximum  
Line of Credit Facility [Line Items]  
Commitment fee percentage 0.375%
Revolving Credit Facility | Credit Facilities  
Line of Credit Facility [Line Items]  
Maximum debt to adjusted EBITDA ratio 2.50
Minimum EBITDA to interest expense ratio 3.0
Revolving Credit Facility | Credit Facilities | Federal Funds Effective Rate  
Line of Credit Facility [Line Items]  
Description of variable rate basis Federal Funds Effective Rate
Fixed spread on variable rate 0.50%
Revolving Credit Facility | Credit Facilities | Eurodollar  
Line of Credit Facility [Line Items]  
Description of variable rate basis Eurodollar rate
Fixed spread on variable rate 1.00%
Revolving Credit Facility | Credit Facilities | Eurodollar | Minimum  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 1.50%
Variable spread on variable rate 0.50%
Revolving Credit Facility | Credit Facilities | Eurodollar | Maximum  
Line of Credit Facility [Line Items]  
Basis spread on variable rate 2.50%
Variable spread on variable rate 1.50%
Revolving Credit Facility | Revolving Credit Facility Maturing August 2018  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity limit $ 100,000,000.0
Letter of Credit | Revolving Credit Facility Maturing August 2018  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity limit 20,000,000.0
Swing Line Loan | Revolving Credit Facility Maturing August 2018  
Line of Credit Facility [Line Items]  
Maximum borrowing capacity limit $ 10,000,000.0