Employee Benefit Plans (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2013 Minimum	Dec. 31, 2012 Minimum	Dec. 31, 2011 Minimum	Dec. 31, 2013 Cumberland MD Vicinity Building Construction Employees Trust Fund Minimum	Dec. 31, 2012 Cumberland MD Vicinity Building Construction Employees Trust Fund Minimum	Jun. 30, 2013 New Zealand Steel Pension Fund	Jun. 30, 2012 New Zealand Steel Pension Fund	Dec. 31, 2013 New Zealand Steel Pension Fund Minimum	Dec. 31, 2012 New Zealand Steel Pension Fund Minimum	Dec. 31, 2011 New Zealand Steel Pension Fund Minimum	Dec. 31, 2013 All other multiemployer plans		Dec. 31, 2012 All other multiemployer plans		Dec. 31, 2011 All other multiemployer plans		Dec. 31, 2013 Significant multiemployer plans for which plan financial information is not publicly available outside the Company's financial statements New Zealand Steel Pension Fund		Dec. 31, 2012 Significant multiemployer plans for which plan financial information is not publicly available outside the Company's financial statements New Zealand Steel Pension Fund		Dec. 31, 2011 Significant multiemployer plans for which plan financial information is not publicly available outside the Company's financial statements New Zealand Steel Pension Fund
Multiemployer Plans [Line Items]
Minimum contribution to the plan in a plan year to classify it as a significant plan as a percent of total contributions (as a percent)									5.00%
Contributions By The Company	$ 17,893,000	[1],[2]	$ 15,814,000	[1],[2]	$ 20,281,000	[1],[2]											$ 17,007,000	[2]	$ 14,905,000	[2]	$ 19,390,000	[2]	$ 886,000	[2]	$ 909,000	[2]	$ 891,000	[2]
Multi-employer Plan, Period Contributions Percentage Threshold																5.00%
Total assets												276,100,000	252,500,000
Total actuarial present value of accumulated plan benefits												302,400,000	283,700,000
Total contributions for all participating employers												$ 13,300,000	$ 10,600,000

[1] (In thousands) Pension ProtectionAct Zone Status ForPlan Years Ended Contributions By The CompanyFor Plan Years Ended (a) ExpirationDate ofCollective-BargainingAgreement Subject toFinancialImprovementPlan IdentificationNumber SurchargeImposed Pension Fund2012 2011 2013 2012 2011 Significant multiemployer plans for which plan financial information is not publicly available outside the Company's financial statements:New Zealand Steel Pension Fund018-054-531 N/A N/A $886 $909 $891 Yes No 2016Summary aggregate information for multiemployer plans which are not individually significant:All other multiemployer plans (b) 17,007 14,905 19,390 Total Contributions $17,893 $15,814 $20,281

[2] These amounts represent either contributions for the plan year as confirmed by plan sponsors or the Company's estimates based on its fiscal year accounts payable records which will be updated as confirmation is received from plan sponsors.