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Debt (Details) - Mar. 31, 2015 - USD ($)
Total
Line of Credit Facility [Line Items]  
Line of credit facility, covenant terms, minimum shareholders' equity $ 320,000,000
Line of credit facility, covenant terms, percentage of shareholders' equity to net income 50.00%
Unsecured Revolving Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Line of Credit Facility, Maximum Borrowing Capacity $ 350,000,000
Line Of Credit Facility Term 5 years