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Long-Term Debt (Narrative) (Details) (USD $) | 9 Months Ended | 12 Months Ended |  |  |  |  |  | 12 Months Ended
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Sep. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Tranche A Notes [Member] | Dec. 31, 2011 Tranche B Notes [Member] | Dec. 31, 2011 Letter Of Credit [Member] | Dec. 31, 2010 Letter Of Credit [Member] | Dec. 31, 2011 Sweep Program [Member] | Aug. 10, 2011 Five-Year Senior Unsecured Revolving Credit Facility [Member] | Dec. 31, 2010 Line Of Credit [Member] | Dec. 31, 2010 Senior Notes [Member] | Dec. 31, 2011 Maximum [Member] | Dec. 31, 2011 Minimum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured senior note outstanding |  | $ 262,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Periodic principal payments |  | 35,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate, minimum |  | 4.00% |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate, maximum |  | 5.85% |  |  |  |  |  |  |  |  |  |  |  |
Effective average interest rate |  | 5.17% | 5.54% |  |  |  |  |  |  |  |  |  |  |
Senior notes, noncurrent |  | 95,000,000 |  |  | 50,000,000 | 45,000,000 |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 4.00% | 4.79% |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | 300,000,000 |  |  |  |  | 150,000,000 |  | 20,000,000 |  |  |  |  |
Current borrowing capacity |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |
Minimum increments under the additional borrowings |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility interest | At our option, revolving loans under the facility bear interest at either: (a) the Applicable Margin Percentage for Base Rate Loans plus the higher of Wells Fargo's prime rate, the federal funds rate plus 0.5% per annum, or the one month LIBOR Rate plus 1.0% per annum; (b) the LIBOR Rate plus the Applicable Margin Percentage for LIBOR Loans; or (c) the LIBOR Market Index Rate ("LIBOR Index Rate") plus the Applicable Margin Percentage for LIBOR Market Index Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin interest on credit facility, low end |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Applicable margin interest on credit facility, high end |  | 1.875% |  |  |  |  |  |  |  |  |  |  |  |
Margin interest during period |  | 1.125% |  |  |  |  |  |  |  |  |  |  |  |
Decreases in marginal interest during period |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, outstanding |  | 0 | 66,230,000 |  |  |  | 49,900,000 | 49,600,000 |  |  | 66,200,000 |  |  |
Proceeds from issuance of long-term debt |  | 96,010,000 | 0 | 0 |  |  |  |  |  |  |  | 95,000,000 |  |
Senior notes, issuance date |  |  |  |  |  |  |  |  |  |  |  | January 3, 2011 |  |
Line of credit fee |  | 1.125% |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.20% |  |  |  |  |  |  |  |  |  |  | 0.30% | 0.175%
Facing fee on outstanding amount of letter of credit |  | 0.125% |  |  |  |  |  |  |  |  |  |  |  |
Minimum amount of dividends payable to shareholder as per credit agreement |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of preceding year net income payable as dividend |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Collateralized property and equipment book value |  | $ 9,200,000 |  |  |  |  |  |  |  |  |  |  |  |

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