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Derivative Financial Instruments (Narrative) (Details) (USD $) |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |  |  | 0 Months Ended |
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Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Oct. 04, 2011 Union Bank [Member] | Dec. 31, 2013 Union Bank [Member] | Dec. 31, 2012 Union Bank [Member] | Oct. 04, 2011 Bank Of America [Member] | Dec. 31, 2013 Bank Of America [Member] | Feb. 06, 2009 Interest Rate Swap [Member] Credit Facility [Member] | Mar. 03, 2008 Interest Rate Swap [Member] Loans [Member] | Aug. 09, 2013 Swap [Member] | Dec. 31, 2013 Swap [Member] | Sep. 30, 2013 Swap [Member] | Oct. 04, 2011 Interest Rate Swap [Member] Union Bank [Member] | Oct. 04, 2011 Interest Rate Swap [Member] Bank Of America [Member] | Aug. 09, 2013 LIBOR [Member] Swap [Member]
Derivative Financial Instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of swap agreement |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.20%
Notional amount | $ 149,000,000 | $ 149,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap agreement collateral |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 40,000,000 |  |  |
Secured loan | 20,000,000 |  | 20,000,000 |  |  |  |  |  | 120,000,000 | 18,000,000 |  |  |  |  |  |
Fixed rate |  |  |  |  |  |  |  |  | 1.93% | 4.25% |  |  |  |  |  |
Maturity date of senior notes |  |  |  |  |  |  |  |  | January 3, 2012 |  |  |  |  |  |  |
Loan maximum borrowing capacity | $ 200,000,000 |  |  |  |  | $ 20,000,000 | $ 18,000,000 | $ 20,000,000 |  |  |  |  |  |  |  |
Floating rate, LIBOR plus basis points (as a percentage) |  |  |  |  | 0.40% |  |  | 0.40% |  |  |  |  |  | 0.40% | 0.50% |
Loan mature date |  |  |  | Jan. 02, 2015 |  |  | Mar. 01, 2013 |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition 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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- Details
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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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- Definition Amount of right to receive securities collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: 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 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 + 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 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 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 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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