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Other Data (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
State income tax expense:      
Texas gross margin tax $ 694hr_StateIncomeTaxExpenseGrossMarginTax [1] $ 649hr_StateIncomeTaxExpenseGrossMarginTax [1] $ 843hr_StateIncomeTaxExpenseGrossMarginTax [1]
Other 58hr_StateIncomeTaxExpenseOther 23hr_StateIncomeTaxExpenseOther 3hr_StateIncomeTaxExpenseOther
Total state income tax expense 752hr_StateIncomeTaxExpense 672hr_StateIncomeTaxExpense 846hr_StateIncomeTaxExpense
State income tax payments, net of refunds and collections $ 593us-gaap_IncomeTaxesPaidNet $ 768us-gaap_IncomeTaxesPaidNet $ 627us-gaap_IncomeTaxesPaidNet
[1] In the table above, income tax expense for 2014 and 2012 includes approximately $0.1 million that was recorded to the gain on sale of real estate properties sold, which is included in discontinued operations rather than general and administrative expenses on the Company’s Consolidated Statements of Operations.