Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities
Accrued salaries and other benefits	$ 94,027	$ 69,106
Accrued income and other taxes	106,907	108,177
Accrued warranty expense	4,561	3,879
Accrued interest	7,483	8,366
Interest rate swaps fair value	3,873	14,250
Deferred income taxes	1,477	3,543
Accrued start-up and commissioning expenses	5,552	14,400
Accrued other liabilities	47,441	53,409
Accrued liabilities	$ 271,321	$ 275,130