v2.4.0.6
Accounts Payable and Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts payable and accrued liabilities    
Accounts payable to vendors $ 130,967 $ 116,723
Accrued salaries, wages, incentive compensation and other fringe benefits 19,237 22,705
Accrued interest 18,450 18,630
Other accrued expenses 30,595 32,458
Total $ 199,249 $ 190,516