Business Combination (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	May 08, 2012
Purchase price:
Cash paid at acquisition	$ 186,814	$ 186,800
Purchase price adjustment	741
Total purchase price	187,555
Allocation of purchase price:
Cash	824
Accounts receivable	1,049
Interest receivable	3,679
Property tax payment agreements receivable	132,978
Fixed assets	461
Other assets	860
Liabilities assumed	(2,265)
Identifiable intangible assets	570
Goodwill	49,399
Total net assets acquired	$ 187,555