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Intangible Assets and Goodwill (Details Textual) (USD $)
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Intangible Assets and Goodwill (Textual) [Abstract] | |||
| Net of accumulated impairment losses | $ 796,725,000 | ||
| Definite lived intangible assets, amortization expense | 1,600,000 | 1,700,000 | 1,700,000 |
| Weighted-average amortization period | 15 years | ||
| Goodwill impairment | $ 0 | $ 0 | $ 0 |
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Lease agreements [Member]
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| Intangible Assets and Goodwill (Textual) [Abstract] | |||
| Weighted-average amortization period | 15 years | ||
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- Details
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- Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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- Definition
The accumulated impairment losses related to goodwill as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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