Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Intangible Assets [Line Items]
Amortization of intangible assets	$ 10,144	$ 4,869
Intangible assets subject to amortization:
Gross Carrying Amount	297,282		$ 296,910
Accumulated Amortization	134,944		124,615
Net Carrying Amount	162,338		172,295
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	245,761		245,630
Goodwill, Carrying Amount	875,657		874,906
Intangible Assets, Gross (Excluding Goodwill)	543,043		542,540
Total
Identifiable intangible assets, net	408,099		417,925
Customer relations
Intangible assets subject to amortization:
Gross Carrying Amount	196,780		196,472
Accumulated Amortization	80,781		74,640
Net Carrying Amount	$ 115,999		121,832
Customer relations | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Customer relations | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	10 years
Contractor Relations [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	$ 69,813		69,764
Accumulated Amortization	42,991		40,124
Net Carrying Amount	$ 26,822		29,640
Contractor Relations [Member] | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Contractor Relations [Member] | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	5 years
Non-compete agreements
Intangible assets subject to amortization:
Gross Carrying Amount	$ 10,889		10,874
Accumulated Amortization	3,626		3,163
Net Carrying Amount	$ 7,263		7,711
Non-compete agreements | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Non-compete agreements | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	7 years
Computer Software, Intangible Asset [Member]
Intangible Assets [Line Items]
Estimated Useful Life	5 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 18,900		18,900
Accumulated Amortization	7,304		6,516
Net Carrying Amount	$ 11,596		12,384
Contract-Based Intangible Assets [Member]
Intangible Assets [Line Items]
Estimated Useful Life	6 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 900		900
Accumulated Amortization	242		172
Net Carrying Amount	$ 658		$ 728