Covenants and Events of Default (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Oct. 28, 2015	Mar. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 243,099	$ 244,323		$ 269,535
Covenant Compliance	As of March 31, 2016, we were in compliance with the covenants contained in our note purchase agreement governing our 2019 Notes and Credit Agreement. We are not aware of any non-compliance by any of our unconsolidated real estate entities with the covenants contained in their debt agreements.
Senior Notes [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 160,000
Debt Instrument, Interest Rate, Stated Percentage	6.11%
Debt, Current	$ 40,000
Long-term Debt, Excluding Current Maturities	30,000
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200,000		$ 298,800
Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	98,800
Term Loan Sublimit for Letters of Credit [Member] [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000