Acquisitions (Narrative) (Details) (USD $)			0 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013 September 2013 Acquisition	Jun. 30, 2014 September 2013 Acquisition	Jun. 30, 2013 September 2013 Acquisition	Jun. 30, 2014 September 2013 Acquisition	Jun. 30, 2013 September 2013 Acquisition	Sep. 30, 2013 September 2013 Acquisition	Jun. 30, 2014 Selling, general and administrative costs September 2013 Acquisition	Jun. 30, 2013 Selling, general and administrative costs September 2013 Acquisition	Jun. 30, 2014 Selling, general and administrative costs September 2013 Acquisition	Jun. 30, 2013 Selling, general and administrative costs September 2013 Acquisition	Jun. 30, 2014 Interest Expense September 2013 Acquisition	Jun. 30, 2014 Interest Expense September 2013 Acquisition
Business Acquisition [Line Items]
Total acquisition related costs				$ (742,000)	$ 2,000	$ (534,000)	$ 322,000		$ (742,000)	$ 2,000	$ (740,000)	$ 119,000
Aggregate purchase consideration								7,454,000
Fair value of business acquisition obligation			2,322,000			1,175,000
Adjustment to payable, expense recorded									742,000		742,000		(26,000)	(53,000)
Goodwill	$ 341,196,000	$ 341,174,000		$ 2,466,000		$ 2,466,000		$ 2,466,000