Goodwill And Intangible Assets (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	$ 31,696	$ 26,051
Accumulated Amortization	(9,309)	(8,701)
Net Carrying Amounts	22,387	17,350
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	26,913	22,682
Accumulated Amortization	(7,847)	(7,299)
Net Carrying Amounts	19,066	15,383
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	1,400	1,156
Accumulated Amortization	(557)	(425)
Net Carrying Amounts	843	731
Customer Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	685	306
Accumulated Amortization	(185)	(184)
Net Carrying Amounts	500	122
Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	114	265
Accumulated Amortization	(17)	(204)
Net Carrying Amounts	97	61
Internally Developed Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amounts	2,584	1,642
Accumulated Amortization	(703)	(589)
Net Carrying Amounts	$ 1,881	$ 1,053