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Fair Value Measurement Fair Value Measurement - Narrative (Details) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current Fiscal Year End Date			--12-31
Derivative, Notional Amount			$ 100,000,000invest_DerivativeNotionalAmount
Asset Retirement Obligation, Revision of Estimate			2,969,000	2,265,000	2,800,000
Restructuring, Settlement and Impairment Provisions			(2,643,000)	52,139,000	(3,728,000)
Restructuring charge (gain)			(2,643,000)us-gaap_RestructuringCharges	52,139,000us-gaap_RestructuringCharges	(3,728,000)us-gaap_RestructuringCharges
Non-cash impairment charges	3,200,000us-gaap_AssetImpairmentCharges	17,800,000us-gaap_AssetImpairmentCharges	1,300,000us-gaap_AssetImpairmentCharges	3,164,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Derivative Asset			300,000us-gaap_DerivativeAssets
Derivative Liability			1,700,000us-gaap_DerivativeLiabilities
Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)	49,000,000		(1,283,000)	48,975,000	(3,728,000)
Restructuring Type, Real Estate Asset Impairment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment charges			(1,360,000)
Restructuring Type, Real Estate Asset Impairment [Member] \| Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)			0	31,090,000	(3,093,000)	1,500,000
Contract Termination [Member] \| Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)				3,234,000	(635,000)
Noncontrolling Interest [Member] \| Restructuring Type, Real Estate Asset Impairment [Member] \| Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)				3,900,000
Quarry property [Member] \| Restructuring Type, Non-performing Quarry Sites [Member] \| Enterprise Improvement Plan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring charge (gain)				14,651,000	0
Variable Interest Entity, Not Primary Beneficiary [Member] \| Joint Venture Unconsolidated [Member] \| Real Estate Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Non-cash impairment charges				3,200,000	3,200,000
Notes Payable to Banks [Member] \| Institutional Group Two [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			6.11%
London Interbank Offered Rate (LIBOR) [Member] \| Notes Payable to Banks [Member] \| Institutional Group Two [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Variable Interest Rate			4.15%
Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Gain (Loss) on Derivative, Net			(1,400,000)
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Gain (Loss) on Derivative, Net			$ 2,000,000