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Long-Term Debt (Details)
Jun. 30, 2015
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, remaining borrowing capacity $ 173,700,000
Line of credit facility, maximum borrowing capacity 300,000,000.0
Letters of credit and bank guarantees outstanding, amount 6,400,000
Debt instrument, collateral amount 2,400,000
Revolving Credit Facility  
Debt Instrument [Line Items]  
Letters of credit and bank guarantees outstanding, amount $ 3,300,000