Covenants and Events of Default (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Debt Instrument [Line Items]
Long-term Debt, Excluding Current Maturities	$ 227,114	$ 229,498	$ 241,907
Covenant Compliance	As of June 2017, 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.
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit agreement	$ 30,000	30,000
Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	92,500
Long term portion of term loan	87,500	90,000	92,500
Short term portion of term loan	5,000	5,000	5,000
Senior Notes [Member] \| 2019 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 120,000	120,000	160,000
Debt Instrument, Interest Rate, Stated Percentage	6.11%
Long-term Debt, Excluding Current Maturities	$ 110,000	110,000	150,000
Scheduled current period payments	40,000	40,000	40,000
Senior Notes [Member] \| 2019 Notes [Member] \| Long-term Debt
Debt Instrument [Line Items]
Scheduled current period payments	30,000	30,000	30,000
Senior Notes [Member] \| 2019 Notes [Member] \| Current Maturities of Long-term Debt
Debt Instrument [Line Items]
Scheduled current period payments	10,000	$ 10,000	$ 10,000
Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	292,500
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	200,000
Term Loan Sublimit for Letters of Credit [Member] [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000

Long term portion of term loan

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Short term portion of term loan

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Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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