Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Amortization of intangible assets	$ 5,199	$ 6,679	$ 15,853	$ 11,197
Intangible assets subject to amortization:
Gross Carrying Amount	144,202		144,202		144,142
Accumulated Amortization	68,049		68,049		52,154
Net Carrying Amount	76,153		76,153		91,988
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	171,916		171,916		171,852
Goodwill, Carrying Amount	496,553		496,553		496,158	229,234
Total
Gross Carrying Amount	812,671		812,671		812,152
Net Carrying Amount	744,622		744,622		759,998
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	103,323		103,323		103,285
Accumulated Amortization	36,865		36,865		23,338
Net Carrying Amount	66,458		66,458		79,947
Customer relations | Minimum
Intangible Assets [Line Items]
Estimated Useful Life			3 months
Customer relations | Maximum
Intangible Assets [Line Items]
Estimated Useful Life			10 years
Contractor relations
Intangible assets subject to amortization:
Gross Carrying Amount	37,884		37,884		37,871
Accumulated Amortization	29,858		29,858		27,754
Net Carrying Amount	8,026		8,026		10,117
Contractor relations | Minimum
Intangible Assets [Line Items]
Estimated Useful Life			2 years
Contractor relations | Maximum
Intangible Assets [Line Items]
Estimated Useful Life			7 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	2,995		2,995		2,986
Accumulated Amortization	1,326		1,326		1,062
Net Carrying Amount	$ 1,669		$ 1,669		$ 1,924
Non-compete agreements | Minimum
Intangible Assets [Line Items]
Estimated Useful Life			2 years
Non-compete agreements | Maximum
Intangible Assets [Line Items]
Estimated Useful Life			7 years