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Business Segment Information (Reconciliation Of Segment Margin To (Loss) Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting [Abstract] |  |  |  |  |  |
Segment margin | $ 262,333 | [1] | $ 202,501 | [1] | $ 149,564 | [1]
Corporate general and administrative expenses | (38,372) |  | (31,685) |  | (110,058) |
Depreciation, amortization and impairment | (61,166) |  | (62,190) |  | (53,569) |
Interest expense | (40,921) |  | (35,767) |  | (22,924) |
Distributable cash from equity investees in excess of equity in earnings | (24,464) |  | (16,681) |  | (2,284) |
Non-cash items not included in segment margin | (5,280) |  | (1,531) |  | (4,479) |
Cash payments from direct financing leases in excess of earnings | (5,016) |  | (4,615) |  | (4,203) |
Income (loss) before income taxes | $ 87,114 |  | $ 50,032 |  | $ (47,953) |
[1] | A reconciliation of Segment Margin to income (loss) before income taxes for each year presented is as follows: Year Ended December 31, 2012 2011 2010Segment margin$262,333 $202,501 $149,564Corporate general and administrative expenses(38,372) (31,685) (110,058)Depreciation, amortization and impairment(61,166) (62,190) (53,569)Interest expense(40,921) (35,767) (22,924)Distributable cash from equity investees in excess of equity in earnings(24,464) (16,681) (2,284)Non-cash items not included in segment margin(5,280) (1,531) (4,479)Cash payments from direct financing leases in excess of earnings(5,016) (4,615) (4,203)Income (loss) before income taxes$87,114 $50,032 $(47,953)

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- Definition Revenues less product costs, operating expenses (excluding non-cash charges such as depreciation and amortization), and segment general and administrative expenses, plus our equity in distributable cash generated by our equity investees. Also excludes the non-cash effects of our stock appreciation rights compensation plan and includes the non-income portion of payments received under direct financing leases. + References No definition available. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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