Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Other Intangible Assets
Gross Carrying Amount	$ 148,027		$ 148,027		$ 145,156
Accumulated Amortization	(65,281)		(65,281)		(58,485)
Other intangible assets, net	82,746		82,746		86,671
Aggregate amortization expense	5,227	5,521	10,374	10,565
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Remainder of 2014	10,655		10,655
2015	19,719		19,719
2016	16,777		16,777
2017	10,420		10,420
2018	6,824		6,824
Thereafter	18,351		18,351
Other intangible assets, net	82,746		82,746		86,671
Noncontractual customer relationships [Member]
Other Intangible Assets
Gross Carrying Amount	110,968		110,968		109,842
Accumulated Amortization	(47,822)		(47,822)		(41,895)
Other intangible assets, net	63,146		63,146		67,947
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	63,146		63,146		67,947
Covenants not-to-compete [Member]
Other Intangible Assets
Gross Carrying Amount	8,672		8,672		8,843
Accumulated Amortization	(4,461)		(4,461)		(4,661)
Other intangible assets, net	4,211		4,211		4,182
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	4,211		4,211		4,182
Favorable lease asset [Member]
Other Intangible Assets
Gross Carrying Amount	9,552		9,552		7,458
Accumulated Amortization	(4,663)		(4,663)		(4,373)
Other intangible assets, net	4,889		4,889		3,085
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	4,889		4,889		3,085
Trademarks [Member]
Other Intangible Assets
Gross Carrying Amount	12,987		12,987		13,115
Accumulated Amortization	(4,696)		(4,696)		(4,194)
Other intangible assets, net	8,291		8,291		8,921
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	8,291		8,291		8,921
Contracts [Member]
Other Intangible Assets
Gross Carrying Amount	608		608		608
Accumulated Amortization	(346)		(346)		(305)
Other intangible assets, net	262		262		303
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	262		262		303
Technology [Member]
Other Intangible Assets
Gross Carrying Amount	5,240		5,240		5,240
Accumulated Amortization	(3,293)		(3,293)		(3,015)
Other intangible assets, net	1,947		1,947		2,225
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	1,947		1,947		2,225
Client lists [Member]
Other Intangible Assets
Gross Carrying Amount	0		0		50
Accumulated Amortization	0		0		(42)
Other intangible assets, net	0		0		8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Other intangible assets, net	$ 0		$ 0		$ 8