Annual report pursuant to Section 13 and 15(d)

Business and Summary of Significant Accounting Principles (Narratives) (Details)

v3.6.0.2
Business and Summary of Significant Accounting Principles (Narratives) (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
payment
entity
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Jan. 01, 2016
USD ($)
Jul. 22, 2013
Business          
Year founded 1979        
Principles of Consolidation [Abstract]          
Percentage of voting interests acquired         33.30%
Percentage of voting interests acquired from noncontrolling interest         66.60%
Number of entities | entity 4        
Redeemable Preferred Stock          
Preferred stock, shares authorized | shares 1,000,000 1,000,000 1,000,000    
Preferred stock, shares outstanding | shares 0 0 0    
Accounts Receivable and Allowance for Doubtful Receivables          
Past due period 120 days        
Number of installment plan payments | payment 12        
Intangible Assets          
Finite-lived intangible asset, useful life 13 years 4 months 3 days        
Goodwill and intangible asset impairment $ 0 $ 0 $ 0    
Impairment of long-lived assets 0   0    
Investments          
Impairment of equity method investment 0 12,593,000 0    
Impairment of cost-method investments 0   0    
Asset Retirement Obligation          
Additional capitalized costs 4,900,000 2,000,000      
Advertising Expense          
Advertising expense 7,000,000 5,700,000 5,700,000    
Interest Expense          
Interest costs capitalized 3,700,000 $ 3,000,000 $ 3,600,000    
Guarantees          
Guarantor liabilities $ 56,000,000        
Minimum | Other Intangible Assets          
Intangible Assets          
Finite-lived intangible asset, useful life 2 years        
Maximum          
Accounts Receivable and Allowance for Doubtful Receivables          
Equipment Installment Plan Payment Term 24 months        
Maximum | Other Intangible Assets          
Intangible Assets          
Finite-lived intangible asset, useful life 20 years        
Accounting Standards Update 2015-03 [Member]          
Accounting Pronouncements          
Debt issuance costs, noncurrent, net       $ 15,400,000