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Financial Instruments - Additional Information (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Fair Value, Measurements, Recurring [Member] |
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| Derivative [Line Items] |
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| Fair value of interest rate swap |
$ 821,000 |
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$ 1,096,000 |
| Interest Rate Swap [Member] |
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| Derivative [Line Items] |
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| Length of interest rate swap |
3 years |
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| Notional amount of interest rate cash flow hedge derivatives |
500,000,000 |
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| Libor rate |
0.52% |
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| Effective interest rate |
2.14% |
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| Basis spread on variable rate |
1.63% |
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| Deferred expenses related to derivative instruments |
800,000 |
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| Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] |
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| Derivative [Line Items] |
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| Cash flow hedge loss reclassified to interest expense |
400,000 |
400,000 |
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| Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |
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| Derivative [Line Items] |
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| Fair value of interest rate swap |
$ 821,000 |
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$ 1,096,000 |