Fair Value Measurement Fair Value Measurement - Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended													3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Enterprise Improvement Plan [Member]	Dec. 31, 2012 Enterprise Improvement Plan [Member]	Dec. 31, 2011 Enterprise Improvement Plan [Member]	Dec. 31, 2010 Enterprise Improvement Plan [Member]	Dec. 31, 2012 Restructuring Type, Real Estate Asset Impairment [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2011 Restructuring Type, Real Estate Asset Impairment [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2012 Contract Termination [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2011 Contract Termination [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2010 Noncontrolling Interest [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2013 Quarry property [Member]	Dec. 31, 2013 Quarry property [Member] Restructuring Type, Non-performing Quarry Sites [Member]	Dec. 31, 2013 Quarry property [Member] Restructuring Type, Non-performing Quarry Sites [Member]	Dec. 31, 2012 Quarry property [Member] Restructuring Type, Non-performing Quarry Sites [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2011 Quarry property [Member] Restructuring Type, Non-performing Quarry Sites [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2010 Real Estate Segment [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2013 Real Estate Segment [Member] Restructuring Type, Real Estate Asset Impairment [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2013 Real Estate Segment [Member] Noncontrolling Interest [Member] Restructuring Type, Real Estate Asset Impairment [Member] Enterprise Improvement Plan [Member]	Dec. 31, 2012 Variable Interest Entity, Not Primary Beneficiary [Member] Real Estate Segment [Member] Joint Venture Unconsolidated [Member] Real Estate Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Retirement Obligation, Revision of Estimate		$ 2,265	$ 2,810	$ (900)
Restructuring charge (gain)					48,975	(3,728)	2,181	109,300	(3,093)	1,452	(635)	32	20,000				0	226	86,300	31,090	3,900
Non-cash impairment charges	$ 3,200	$ 3,164	$ 0	$ 0										$ 17,800	$ 3,200	$ 3,200						$ 3,200