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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Dec. 20, 2011	Dec. 31, 2018	Dec. 31, 2017	Aug. 16, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment available for sale		$ 15,300	$ 17,300
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage			9.20%
Available-for-sale securities, current portion		500	$ 500
Fair Value, Discount Amount, Available for sales securities		$ 2,800	2,900
Payment to option holder, percentage of EBITDA		1.00%
Payment to option holder, term		10 years
Contingent consideration, liability for payments to option holder, current		$ 800	800
Contingent consideration, liability for payments to option holder, noncurrent		1,600	2,100
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, gross		20,000
Investment available for sale		$ 15,772	17,752
Debt security, interest rate		7.50%
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment available for sale		$ 15,772	$ 17,752
Kansas Star
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment to option holder, percentage of EBITDA	1.00%
Payment to option holder, term	10 years
Other Long-term Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Term		96 months
Senior Notes | 8.375% Senior Notes due 2018 | Peninsula
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate				8.375%
Available-for-sale Securities [Member] | Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage		11.20%	9.60%
Contingent Payments | Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques, Unobservable Inputs, Rate, Percentage		6.80%

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