Goodwill Impairment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 item	Dec. 31, 2012
Goodwill Impairment
Number of reporting units that utilized the market approach	3
Number of reporting units in which fair value testing was performed	4
Number of reporting units that utilized the income approach	1
Goodwill:
Goodwill, beginning of period		$ 1,066,754
Other - Primary Currency Translation		(2,345)
Impairments		(1,064,409)
U.S. Operations
Goodwill
Number of reporting units that recorded impairment charge	2
Goodwill:
Goodwill, beginning of period		74,320
Impairments		(74,320)
Canadian and U.K. operations
Goodwill
Number of reporting units that recorded impairment charge	2
Goodwill:
Goodwill, beginning of period		992,434
Other - Primary Currency Translation		(2,345)
Impairments		$ (990,089)