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Lease Exit Costs (Details) (USD $)
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1 Months Ended |
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Sep. 30, 2014
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Aug. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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| Bannockburn |
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| Operating Leased Assets [Line Items] |
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| Lease loss accrual, cash outflow |
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$ 7,000,000 |
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| Bannockburn | Accrued expenses and other current liabilities |
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| Operating Leased Assets [Line Items] |
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| Lease loss accrual |
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|
6,900,000 |
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| Bannockburn | Selling, general and administrative expenses |
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| Operating Leased Assets [Line Items] |
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| Lease loss expense |
5,700,000 |
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| Maryland |
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| Operating Leased Assets [Line Items] |
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| Lease loss accrual, cash outflow |
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6,100,000 |
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| Maryland | Accrued expenses and other current liabilities |
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| Operating Leased Assets [Line Items] |
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| Lease loss accrual |
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5,215,000 |
5,774,000 |
| Maryland | Selling, general and administrative expenses |
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| Operating Leased Assets [Line Items] |
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| Lease loss expense |
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$ 5,600,000 |
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