Additional Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes in operating assets and liabilities, net of effect of businesses acquired [Abstract]
Accounts receivable	$ (16,870)	$ 33,004	$ 61,918
Inventories	(31,246)	(186)	(13,829)
Prepaid expenses and other current assets	19,160	2,977	(14,273)
Accounts payable	11,087	(9,408)	(11,468)
Other current liabilities	7,860	(31,539)	(74,851)
Net change in operating assets and liabilities	$ (10,009)	$ (5,152)	$ (52,503)