Accounts Payable and Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts Payable and Accrued Liabilities [Abstract]
Accounts payable	$ 361,169	$ 334,036
Customer deposits	698,770	684,469
Employee related liabilities	356,188	330,492
Miscellaneous other	393,099	491,468
Accounts payable and accrued liabilities	$ 1,809,226	$ 1,840,465