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Revolving Credit Facility and Long-Term Debt Revolving Credit Facility and Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified |  |  |  |  |  |  | 12 Months Ended
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Dec. 31, 2011 Wells Fargo Credit Agreement [Member] | Dec. 31, 2011 Wells Fargo Credit Agreement [Member] Fixed 30 Day Interest Rate 1 [Member] | Dec. 31, 2010 Wells Fargo Credit Agreement [Member] Fixed 30 Day Interest Rate 1 [Member] | Dec. 31, 2011 Wells Fargo Credit Agreement [Member] Fixed 30 Day Interest Rate 2 [Member] | Dec. 31, 2011 Wells Fargo Credit Agreement [Member] Swingline Variable Interest Rate [Member] | Dec. 31, 2010 Wells Fargo Credit Agreement [Member] Swingline Variable Interest Rate [Member] | Dec. 31, 2009 Wells Fargo Credit Agreement [Member] Fixed Interest Rate Swap Agreement [Member] | Dec. 31, 2010 Bank of America Line Of Credit [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Borrower's Option 1 [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Borrower's Option 2 [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Borrower's Option 3 [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Default Option [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Base Rate Option 1 [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Base Rate Option 2 [Member] | Dec. 31, 2011 Line of Credit [Member] Wells Fargo Credit Agreement [Member] Base Rate Option 3 [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 125.0 |  |  |  |  |  |  | $ 30.0 |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  | 0.25% | 1.25% | 1.25% | 1.25% |  | 0.50% | 1.00%
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  | base rate | London Inter-Bank Offered Rate (“LIBOR”) Market Index Rate | LIBOR Rate | LIBOR Market Index Rate | prime rate (as announced by Wells Fargo) | federal funds rate | LIBOR for an interest period of one month
Line of Credit Facility, Amount Outstanding | 30.7 | 24.0 | 22.0 | 5.0 | 1.7 | 4.5 | 55.0 |  |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 94.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.54% | 1.52% | 1.55% | 1.84% | 1.56% | 2.73% |  |  |  |  |  |  |  |

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Interest rate stated in the contractual debt agreement. + 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 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 Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: 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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