Debt (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term principal	$ 587,485	$ 607,585
Less debt issuance costs	(3,015)	(3,037)
Less unamortized discounts	(729)	(1,248)
Total long-term debt (includes current portion)	583,988	603,881
Less current portion of long-term debt	(11,032)	(5,007)
Long-term debt	572,956	598,874
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Long-term principal	247	581
Term loans, variable rate 2.50% to 3.00% due 2019 through 2026 and fixed rate 2.95% to 4.64% due 2017 through 2024 [Member]
Debt Instrument [Line Items]
Long-term principal	349,500	322,000
Senior notes, 7.50%, due 2019 [Member]
Debt Instrument [Line Items]
Long-term principal	150,000	150,000
Revenue bonds, 2.75% due 2024 [Member]
Debt Instrument [Line Items]
Long-term principal	65,735	108,335
Medium-term notes, 8.75% to 8.89%, due 2017 through 2022 [Member]
Debt Instrument [Line Items]
Long-term principal	$ 22,250	$ 27,250

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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Amount of the fee that accompanies borrowing money under the debt instrument.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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