Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal:
Current	$ 10,410,000	$ 11,136,000	$ (2,330,000)
Deferred	9,518,000	7,914,000	(36,519,000)
Total federal	19,928,000	19,050,000	(38,849,000)
State:
Current	4,689,000	2,952,000	(1,071,000)
Deferred	(3,508,000)	1,346,000	(4,008,000)
Total state	1,181,000	4,298,000	(5,079,000)
Total provision for (benefit from) income taxes	21,109,000	23,348,000	(43,928,000)
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal statutory tax	28,360,000	31,301,000	(37,232,000)
State taxes, net of federal tax benefit	5,299,000	3,497,000	(4,500,000)
Percentage depletion deduction	(1,422,000)	(1,254,000)	(997,000)
Domestic production deduction	(1,367,000)	(1,604,000)	100,000
Noncontrolling interests	(5,124,000)	(5,223,000)	1,213,000
Settlements and effective settlements of audit issues	0	(2,348,000)	330,000
Other	(752,000)	(2,021,000)	(3,127,000)
Total provision for (benefit from) income taxes	21,109,000	23,348,000	(43,928,000)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal statutory tax, Percent	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit, Percent	6.50%	3.90%	4.20%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(7.20%)	0.00%	0.00%
Percentage depletion deduction, Percent	(1.80%)	(1.40%)	0.90%
Domestic production deduction, Percent	(1.70%)	(1.80%)	(0.10%)
Noncontrolling interests, Percent	(6.30%)	(5.80%)	(1.10%)
Settlements and effective settlements of audit issues, Percent	0.00%	(2.60%)	(0.30%)
Other, Percent	(0.80%)	(2.30%)	3.00%
Total, Percent	26.10%	26.10%	41.30%
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(5,803,000)	0	0
Income Tax Reconciliation, Nondeductible Expense	1,918,000	1,000,000	285,000
Effective Income Tax Rate Reconciliation, Nondeductible Expense	2.40%	1.10%	(0.30%)
Deferred tax assets:
Receivables	2,876,000	2,929,000
Inventory	5,611,000	6,308,000
Insurance	10,476,000	7,142,000
Deferred compensation	14,055,000	16,485,000
Other accrued liabilities	7,184,000	9,244,000
Contract income recognition	4,171,000	4,253,000
Impairments on real estate investments	5,002,000	18,895,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits	6,064,000	4,606,000
Other	416,000	300,000
Net operating loss carryforward	8,359,000	9,510,000
Valuation allowance	(5,242,000)	(10,668,000)	(13,111,000)
Total deferred tax assets	58,972,000	69,004,000
Deferred tax liabilities:
Property and equipment	30,448,000	34,467,000
Total deferred tax liabilities	30,448,000	34,467,000
Net deferred tax assets	28,524,000	34,537,000
Deferred Tax Assets, Net, Classification [Abstract]
Current deferred tax assets, net	36,687,000	38,571,000
Long-term deferred tax liabilities, net	8,163,000	4,034,000
Net deferred tax assets	28,524,000	34,537,000
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	10,668,000	13,111,000	13,018,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	(5,426,000)	(2,443,000)	93,000
Ending balance	5,242,000	10,668,000	13,111,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	3,100,000
Ending balance	3,200,000	3,100,000
Unrecognized Tax Benefits	3,200,000	3,100,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	800,000	1,100,000
Unrecognized Tax Benefits, Interest on Income Taxes Expense	100,000	(100,000)	400,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	900,000	800,000
Other Long Term Liabilities [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	2,339,000	5,650,000	5,882,000
Gross increases – current period tax positions	1,017,000	1,726,000	180,000
Gross decreases – current period tax positions	(800,000)	(1,420,000)	(453,000)
Gross increases – prior period tax positions	4,000	1,485,000	4,009,000
Gross decreases – prior period tax positions	(245,000)	(1,467,000)	(1,641,000)
Settlements with taxing authorities/lapse of statute of limitations	0	(3,635,000)	(2,327,000)
Ending balance	2,315,000	2,339,000	5,650,000
Unrecognized Tax Benefits	$ 2,315,000	$ 2,339,000	$ 5,650,000