Annual report pursuant to Section 13 and 15(d)

Income Taxes (Tax effects of temporary differences) (Details)

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Income Taxes (Tax effects of temporary differences) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current deferred tax assets, net of current deferred tax liability:    
Net operating loss carryforwards $ 30,344 $ 3,952
Compensated absences, accrued for financial reporting purposes 2,956 2,605
Workers compensation and self-insurance health reserves, principally due to accrual for financial reporting purposes 1,688 1,357
Accounts receivable, principally due to allowance for doubtful receivables 1,154 1,319
Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes 104 32
Deferred revenue for financial reporting purposes 2,673 2,734
Other 834 898
Total current deferred tax assets 39,753 12,897
Long-term deferred tax assets:    
Net operating loss carryforwards 90,589 116,034
Deferred revenue for financial reporting purposes 35,506 36,316
Alternative minimum tax credits 1,895 1,895
Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes 2,556 2,543
Asset retirement obligations in excess of amounts recognized for tax purposes 4,930 6,680
Share-based compensation expense for financial reporting purposes in excess of amounts recognized for tax purposes 1,860 1,675
Other 4,335 3,353
Total long-term deferred tax assets 141,671 168,496
Long-term deferred tax liabilities:    
Plant and equipment, principally due to differences in depreciation 212,719 233,530
Intangible assets 49,761 58,627
Flow-through entity deferred tax items 40,667 0
Total long-term deferred tax liabilities 303,147 292,157
Net long-term deferred tax liabilities $ 161,476 $ 123,661