Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Amortization of intangible assets	$ 5,275	$ 3,884	$ 10,654	$ 4,518
Intangible assets subject to amortization:
Gross Carrying Amount	144,082		144,082		144,142
Accumulated Amortization	62,765		62,765		52,154
Net Carrying Amount	81,317		81,317		91,988
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	171,789		171,789		171,852
Goodwill, Carrying Amount	495,638		495,638		496,158	229,234
Total
Gross Carrying Amount	811,509		811,509		812,152
Net Carrying Amount	748,744		748,744		759,998
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	103,247		103,247		103,285
Accumulated Amortization	32,352		32,352		23,338
Net Carrying Amount	70,895		70,895		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	37,857		37,857		37,871
Accumulated Amortization	29,158		29,158		27,754
Net Carrying Amount	8,699		8,699		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	2,978		2,978		2,986
Accumulated Amortization	1,255		1,255		1,062
Net Carrying Amount	$ 1,723		$ 1,723		$ 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