Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
Income Taxes (Tax effects of temporary differences) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating loss carryforwards $ 139,238 $ 131,938
Deferred revenue for financial reporting purposes 41,151 36,077
Asset retirement obligations in excess of amounts recognized for tax purposes 14,338 6,660
Compensated absences accrued for financial reporting purposes 3,339 3,117
Share-based compensation expense for financial reporting purposes in excess of amounts recognized for tax purposes 2,773 1,458
Accounts receivable, principally due to allowance for doubtful receivables 1,912 2,585
Workers compensation and self-insurance health reserves, principally due to accrual for financial reporting purposes 1,795 2,043
Alternative minimum tax credits 1,735 1,735
Deferred compensation expense for tax purposes in excess of amounts recognized for financial reporting purposes 1,603 1,374
Other 13,144 5,866
Total deferred tax assets 221,028 192,853
Deferred tax liabilities:    
Plant and equipment, principally due to differences in depreciation 246,172 231,109
Intangible assets 79,255 48,768
Flow-through entity deferred tax items 0 44,728
Other 1,746 0
Total deferred tax liabilities 327,173 324,605
Net deferred tax liabilities $ 106,145 $ 131,752