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Long-Term Debt (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Senior Notes | $ 227,143,000 | $ 262,857,000
Maximum borrowing capacity | 300,000,000 |
Minimum increments under the additional borrowings | 25,000,000 |
Interest Rate Spread added to LIBOR Rate | 1.00% |
Interest Rate Spread added to Federal Funds Rate | 0.50% |
Line of credit, outstanding | 10,000,000 | 0
Facing fee on outstanding amount of letter of credit | 0.125% |
Minimum amount of dividends payable to shareholder as per credit agreement | 20.0 |
Percentage of preceding year net income payable as dividend | 25.00% |
Collateralized property and equipment book value | 7,600,000 |
Letter Of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 150,000,000 |
Line of credit, outstanding | 52,400,000 | 49,900,000
Sweep Program [Member] |  |
Debt Instrument [Line Items] |  |
Maximum borrowing capacity | 20,000,000 |
Five-Year Senior Unsecured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Current borrowing capacity | 200,000,000 |
Applicable Margin Interest On Credit Facility Low End | 1.00% |
Applicable Margin Interest On Credit Facility High End | 1.875% |
Interest Rate Spread added to LIBOR Rate | 1.125% | 1.125%
Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Periodic principal payments | $ 35,700,000 |
Fixed interest rate, minimum | 4.00% |
Fixed interest rate, maximum | 5.85% |
Effective average interest rate | 5.07% | 5.17%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to LIBOR Rate | 1.125% |
Letter of credit fee | 1.125% |
Commitment fee percentage | 0.20% |
Line Of Credit Facility Commitment Stated Fee Percentage | 0.30% |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Interest Rate Spread added to LIBOR Rate | 1.00% |
Letter of credit fee | 1.00% |
Commitment fee percentage | 0.175% |
Line Of Credit Facility Commitment Stated Fee Percentage | 0.175% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 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 Reference 3: 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 + Details
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