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Summarized Financial Information of Unconsolidated Joint Ventures (Assets, Liabilities, and Equity) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]    
Current assets $ 31,155us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets $ 32,033us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Noncurrent assets 9,427us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets 10,303us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Current liabilities 6,473us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities 5,943us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Shareholders' equity $ 34,109us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity $ 36,393us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity