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Long-Term Debt (Summary of Long-Term Debt) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Aug. 14, 2013
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
6% senior notes due 2023 (net of unamortized discount of $6,692 at 2015 and $7,557 at 2014) | $ 493,308,000 | $ 492,443,000 | $ 500,000,000
Less unamortized debt issuance costs | (3,526,000) | (4,193,000) |
Total notes payable, net | 489,782,000 | 488,250,000 |
Capitalized lease obligations, vehicles, due through 2018 | 600,000 | 0 |
Less current maturities | (222,000) | 0 |
Long-term debt | 490,160,000 | 488,250,000 |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (percent) |  |  | 6.00%
Unamortized Discount | $ 6,692,000 | $ 7,557,000 |
Senior Notes [Member] | 6% Senior Notes Due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate (percent) | 6.00% | 6.00% |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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