Goodwill and Identifiable Assets (Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Intangible assets subject to amortization:
Gross Carrying Amount	$ 296,586	$ 296,910
Accumulated Amortization	164,373	124,615
Net Carrying Amount	132,213	172,295
Intangible assets not subject to amortization:
Trademarks, Carrying Amount	245,517	245,630
Goodwill	873,513	874,906
Total
Gross Carrying Amount	542,103	542,540
Net Carrying Amount	377,730	417,925
Customer Relationships [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	196,204	196,472
Accumulated Amortization	98,804	74,640
Net Carrying Amount	$ 97,400	121,832
Customer Relationships [Member] | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 months
Customer Relationships [Member] | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	10 years
Contractor Relations [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	$ 69,721	69,764
Accumulated Amortization	50,528	40,124
Net Carrying Amount	$ 19,193	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
Noncompete Agreements [Member]
Intangible assets subject to amortization:
Gross Carrying Amount	$ 10,861	10,874
Accumulated Amortization	4,922	3,163
Net Carrying Amount	$ 5,939	7,711
Noncompete Agreements [Member] | Minimum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	2 years
Noncompete Agreements [Member] | Maximum [Member]
Intangible Assets [Line Items]
Estimated Useful Life	7 years
Contract-Based Intangible Assets [Member]
Intangible Assets [Line Items]
Estimated Useful Life	5 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 900	900
Accumulated Amortization	453	172
Net Carrying Amount	$ 447	728
Computer Software, Intangible Asset [Member]
Intangible Assets [Line Items]
Estimated Useful Life	6 years
Intangible assets subject to amortization:
Gross Carrying Amount	$ 18,900	18,900
Accumulated Amortization	9,666	6,516
Net Carrying Amount	$ 9,234	$ 12,384