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Notes Payable - Debt Outstanding (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Mar. 07, 2012 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Dec. 31, 2011 Notes Payable under Revolving Credit Agreement Former Credit Agreement [Member] | Dec. 31, 2013 Senior Notes [Member] Senior Notes, 6% Due May 15, 2017 [Member] | Dec. 31, 2012 Senior Notes [Member] Senior Notes, 6% Due May 15, 2017 [Member] | Dec. 31, 2013 Senior Notes [Member] Senior Notes, 6% Due November 30, 2015 [Member] | Dec. 31, 2012 Senior Notes [Member] Senior Notes, 6% Due November 30, 2015 [Member] | Dec. 31, 2013 Mortgage Note Payable [Member] | Dec. 31, 2012 Mortgage Note Payable [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 245,000,000.0 |  |  |  |  |  |  |  |
Notes Payable | 606,900,000 | 611,400,000 |  |  |  | 357,900,000 | 357,300,000 | 249,000,000 | 248,600,000 | 0 | 5,500,000
Line of Credit Facility, Amount Outstanding |  |  |  | $ 0 | $ 0 |  |  |  |  |  |

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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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- 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 Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 02 -Paragraph 19, 20, 22 -Article 5 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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