Debt (Details Textual) (USD $)	Mar. 31, 2014	Mar. 04, 2014
Line of Credit Facility [Line Items]
Total borrowing capacity under lines of credit	$ 878,100,000	$ 400,000,000
Total available for borrowings under lines of credit	621,600,000
Secured Debt
Line of Credit Facility [Line Items]
Total borrowing capacity under lines of credit	28,100,000
Line of Credit
Line of Credit Facility [Line Items]
Total borrowing capacity under lines of credit		$ 850,000,000