Long-Term Debt (Sale Leaseback Financing Obligation) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 04, 2013 Company Dealer
Debt Disclosure [Abstract]
Number of companies completed sale leaseback transaction \| Company			2
Number of dealer operated sites \| Dealer			50
Sale Leaseback Transaction, Imputed Interest Rate	5.125%
Sale leaseback financing obligation \| $	$ 120,878	$ 121,992

The liability due as of the balance sheet date for leasebacks accounted for using the deposit method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694

Name:	us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant