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