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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net income $ 43,544 $ 51,212
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 71,814 67,581
Stock-based compensation expense, net 4,284 1,017
(Benefit) provision for deferred income taxes (11,455) 1,487
Net loss on sales of property, plant and equipment 917 313
Changes in operating assets and liabilities:    
Accounts receivable, net (51) 6,048
Prepaid assets (501) (4,909)
Accounts payable and accrued liabilities 8,314 $ (7,948)
Income taxes payable (432)  
Deferred revenue 879 $ 10
Other assets and other liabilities, net (76) (508)
Net cash provided by operating activities 117,237 114,303
Cash flows from investing activities:    
Cash paid for property, plant and equipment (74,430) (85,781)
Net proceeds from sales of property, plant and equipment $ 14 120
Other   (24)
Net cash used in investing activities $ (74,416) (85,685)
Cash flows from financing activities:    
Net transfers to Parent (37,079) $ (30,999)
Proceeds from issuance of long-term debt, net of issuance costs 541,114  
Payments of debt issue costs (1,768)  
Dividends paid to Parent (450,000)  
Cash overdraft 3,967 $ 3,328
Net cash provided by (used in) financing activities 56,234 (27,671)
Change in cash and cash equivalents 99,055 947
Cash and cash equivalents, beginning of period 6,410 6,238
Cash and cash equivalents, end of period 105,465 7,185
Supplemental cash flow disclosures:    
Cash paid for income taxes 2,810 1,586
Non-cash activity:    
Capital expenditures in accounts payable $ 5,164 $ 17,514