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Consolidated Financial Statements Consolidated Financial Statements (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]        
Total Inventories $ 585,185     $ 572,047
Accounts payable 259,208     285,501
Net cash provided by operating activities 329,353 $ 294,695    
Net cash provided by (used in) financing activities 65,775 66,878    
Proceeds from sale of finance receivables $ 25,800 $ 200    
Restatement Adjustment [Member] | Revision to Properly Reflect Inventory in Transit [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Total Inventories       (17,000)
Accounts payable       $ (17,000)
Scenario, Forecast [Member] | Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] | Minimum [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Net cash provided by operating activities     $ 20,000  
Net cash provided by (used in) financing activities     (20,000)  
Scenario, Forecast [Member] | Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] | Maximum [Member]        
New Accounting Pronouncement, Early Adoption [Line Items]        
Net cash provided by operating activities     25,000  
Net cash provided by (used in) financing activities     $ (25,000)