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Debt Obligations (Details Textuals) (USD $) In Millions, unless otherwise specified |  |  |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2014 Secured Debt [Member] | Jun. 30, 2013 Secured Debt [Member] | Jun. 30, 2014 Unsecured Debt [Member] Three Year Term Loan [Member] | Jun. 30, 2014 Unsecured Debt [Member] Letter of Credit [Member] | Jun. 30, 2014 Unsecured Debt [Member] Line of Credit [Member] | Jun. 30, 2014 Unsecured Debt [Member] Four Year Term Loan [Member] | Jun. 30, 2014 Unsecured Debt [Member] Seven Year Term Loan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate | 5.73% | 6.64% |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 1.50% |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 1.5 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 598.5 |  |
Debt Instrument, Face Amount |  |  | 150.0 |  |  | 250.0 | 200.0
Line of Credit Facility, Option for Additional Borrowing Capacity subject to customary conditions and limitations |  |  |  |  | $ 200.0 |  |
Declining prepayment penalty after Three Years |  |  |  |  |  |  | 1.00%
Derivative, Average Fixed Interest Rate |  |  | 2.596% |  |  |  | 3.623%

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- Definition Declining Prepayment Penalty After Three Years + References No definition available. + Details
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- Definition Line of Credit Facility, Option for Additional Borrowing Capacity subject to customary conditions and limitations + References No definition available. + 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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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 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 Weighted average interest rate of long-term debt outstanding. + References No definition available. + Details
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