Acquisitions Acquisitions (Net Assets Acquired) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Cash and cash equivalents	$ 6,342
Goodwill	254,664	$ 1,137	$ 1,137	$ 0
SBS [Member]
Business Acquisition [Line Items]
Accounts receivable	124,526
Inventories	115,888
Other current assets	26,314
Property and equipment	126,057
Favorable lease agreements	5,050
Other long-term assets	1,302
Accounts payable	77,062
Accrued expenses and other liabilities	40,652
Unfavorable lease agreements	4,550
Current portion of capital lease obligations	3,275
Other current liabilities	6,664
Long-term debt	67,713
Deferred income taxes	75,006
Long-term portion of capital lease obligations	11,612
Other long-term liabilities	5,666
Identifiable net assets acquired	253,691
Goodwill	199,699
Total net assets acquired	453,390
RBI [Member]
Business Acquisition [Line Items]
Accounts receivable	8,343
Inventories	6,702
Other current assets	122
Property and equipment	5,524
Other current liabilities	3,182
Identifiable net assets acquired	57,809
Goodwill	44,541
Total net assets acquired	102,350
VNS [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	2,344
Accounts receivable	19,594
Inventories	10,665
Other current assets	952
Property and equipment	11,643
Other long-term assets	59
Accounts payable	7,464
Accrued expenses and other liabilities	4,087
Deferred income taxes	4,364
Identifiable net assets acquired	40,192
Goodwill	9,287
Total net assets acquired	49,479
Customer relationships [Member] | SBS [Member]
Business Acquisition [Line Items]
Intangible assets acquired	129,800
Customer relationships [Member] | RBI [Member]
Business Acquisition [Line Items]
Intangible assets acquired	39,900
Customer relationships [Member] | VNS [Member]
Business Acquisition [Line Items]
Intangible assets acquired	10,000
Trademarks [Member] | SBS [Member]
Business Acquisition [Line Items]
Intangible assets acquired	4,500
Trademarks [Member] | VNS [Member]
Business Acquisition [Line Items]
Intangible assets acquired	850
Noncompete Agreements [Member] | SBS [Member]
Business Acquisition [Line Items]
Intangible assets acquired	6,112
Noncompete Agreements [Member] | RBI [Member]
Business Acquisition [Line Items]
Intangible assets acquired	$ 400