Acquisitions (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 09, 2015	Dec. 31, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 291,940,000		$ 291,940,000			$ 236,044,000
RBI
Business Acquisition [Line Items]
Aggregate purchase consideration						$ 142,506,000
Accrued payable						6,302,000
Goodwill						56,500,000
Goodwill, tax deductible amount						38,725,000
Indemnification asset						$ 3,000,000
Total acquisition related costs		381,000		1,389,000
September 2013 Acquisition
Business Acquisition [Line Items]
Aggregate purchase consideration	$ 7,454,000							$ 7,454,000
Goodwill	2,466,000							$ 2,466,000
Total acquisition related costs		0	$ (781,000)	(480,000)	$ (1,315,000)
Fair value of business acquisition obligation	$ 2,322,000			61,000
Selling, general and administrative costs | RBI
Business Acquisition [Line Items]
Total acquisition related costs		209,000		1,159,000
Selling, general and administrative costs | September 2013 Acquisition
Business Acquisition [Line Items]
Total acquisition related costs		$ 0	$ (781,000)	(480,000)	$ (1,521,000)
Adjustment to payable, expense recorded				480,000
Interest Expense | September 2013 Acquisition
Business Acquisition [Line Items]
Adjustment to payable, expense recorded				$ 8,000