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Revolving Line of Credit (Narrative) (Details) (USD $)
3 Months Ended
Jun. 30, 2012
Line of Credit Facility [Abstract]  
Revolving credit agreement initiation date Apr. 19, 2012
Borrowing limit under the unsecured revolving credit facility $ 100,000,000
Revolving credit sublimit 15,000,000
Basis spread on variable interest rate 0.50%
Covenant Terms, Leverage Ratio Requirement 1.75
Covenant terms, interest coverage ratio 3.50
Line of Credit Facility, Amount Outstanding $ 0