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Debt Obligations Debt Obligations (Details Textuals) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Unsecured credit facility | $ 0 |  | $ 69,000,000
Repayments of Unsecured Debt | 0 | 37,500,000 |
Secured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Weighted Average Interest Rate | 6.65% | 6.72% |
Long-term Debt, Gross | 441,177,000 |  | 443,942,000
Unsecured Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | 1,958,953,000 |  | 2,027,953,000
Unsecured Debt [Member] | Three Year Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 150,000,000 |  |
Derivative, Average Fixed Interest Rate |  |  | 2.596%
Notional Amount of Interest Rate Cash Flow Hedge Derivatives |  |  | 150,000,000
Long-term Debt, Gross | 150,000,000 |  | 150,000,000
Unsecured Debt [Member] | Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Letters of Credit Outstanding, Amount | 900,000 |  |
Unsecured Debt [Member] | Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 599,100,000 |  |
Line of Credit Facility, Option for Additional Borrowing Capacity subject to customary conditions and limitations | 200,000,000 |  |
Long-term Debt, Gross | 0 |  | 69,000,000
Unsecured Debt [Member] | Four Year Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 100,000,000 |  |
Unsecured Debt [Member] | Seven Year Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 200,000,000 |  |
Declining prepayment penalty in Year One | 3.00% |  |
Declining prepayment penalty in Year Two | 2.00% |  |
Declining prepayment penalty in Year Three | 1.00% |  |
Derivative, Average Fixed Interest Rate |  |  | 3.623%
Long-term Debt, Gross | $ 200,000,000 |  | $ 200,000,000

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 FASB Staff Position (FSP) -Number APB14-1 -Paragraph 31 -Subparagraph b -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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