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Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Cash Flows)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities $ 39,656 $ (5,817) $ 5,131
Cash flows from investing activities:      
Purchases of property and equipment (67,148) (63,277) (32,381)
Proceeds from sale of property and equipment 5,864 12,569 7,577
Proceeds from insurance recoveries 1,082 3,344 37
Net cash provided by (used in) investing activities (60,202) (47,364) (24,767)
Cash flows from financing activities:      
Debt repayments 0 (120,000) (71,000)
Proceeds from issuance of debt 0 245,500 22,000
Debt issuance costs 0 (6,332) (819)
Proceeds from exercise of options 11 0 183
Proceeds from common stock, net of offering costs 0 0 65,430
Purchase of treasury stock (549) (533) (124)
Proceeds from (Payments for) Contributions from Affiliates 0 0 0
Net cash provided by (used in) financing activities (538) 118,635 15,670
Net increase (decrease) in cash, cash equivalents and restricted cash (21,084) 65,454 (3,966)
Beginning cash, cash equivalents, and restricted cash 75,648 10,194 14,160
Ending cash, cash equivalents, and restricted cash 54,564 75,648 10,194
Eliminations [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities 0 0 0
Cash flows from investing activities:      
Purchases of property and equipment 0 431 0
Proceeds from sale of property and equipment 0 (431) 0
Proceeds from insurance recoveries 0 0 0
Net cash provided by (used in) investing activities 0 0 0
Cash flows from financing activities:      
Debt repayments   0 0
Proceeds from issuance of debt   0 0
Debt issuance costs   0 0
Proceeds from exercise of options 0   0
Proceeds from common stock, net of offering costs     0
Purchase of treasury stock 0 0 0
Proceeds from (Payments for) Contributions from Affiliates 0 0 0
Net cash provided by (used in) financing activities 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0 0
Beginning cash, cash equivalents, and restricted cash 0 0 0
Ending cash, cash equivalents, and restricted cash 0 0 0
Guarantor Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities 84,663 26,609 40,187
Cash flows from investing activities:      
Purchases of property and equipment (59,478) (56,556) (31,049)
Proceeds from sale of property and equipment 5,826 12,768 7,523
Proceeds from insurance recoveries 1,066 3,344 37
Net cash provided by (used in) investing activities (52,586) (40,444) (23,489)
Cash flows from financing activities:      
Debt repayments   0 0
Proceeds from issuance of debt   0 0
Debt issuance costs   0 0
Proceeds from exercise of options 0   0
Proceeds from common stock, net of offering costs     0
Purchase of treasury stock 0 0 0
Proceeds from (Payments for) Contributions from Affiliates (32,077) 13,835 (16,698)
Net cash provided by (used in) financing activities (32,077) 13,835 (16,698)
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0 0
Beginning cash, cash equivalents, and restricted cash 0 0 0
Ending cash, cash equivalents, and restricted cash 0 0 0
Non-Guarantor Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities 6,940 8,759 (560)
Cash flows from investing activities:      
Purchases of property and equipment (6,593) (6,407) (880)
Proceeds from sale of property and equipment 38 232 54
Proceeds from insurance recoveries 16 0 0
Net cash provided by (used in) investing activities (6,539) (6,175) (826)
Cash flows from financing activities:      
Debt repayments   0 0
Proceeds from issuance of debt   0 0
Debt issuance costs   0 0
Proceeds from exercise of options 0   0
Proceeds from common stock, net of offering costs    
Purchase of treasury stock 0 0 0
Proceeds from (Payments for) Contributions from Affiliates (448) (381) (105)
Net cash provided by (used in) financing activities (448) (381) (105)
Net increase (decrease) in cash, cash equivalents and restricted cash (47) 2,203 (1,491)
Beginning cash, cash equivalents, and restricted cash 3,263 1,060 2,551
Ending cash, cash equivalents, and restricted cash 3,216 3,263 1,060
Parent [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities (51,947) (41,185) (34,496)
Cash flows from investing activities:      
Purchases of property and equipment (1,077) (745) (452)
Proceeds from sale of property and equipment 0 0 0
Proceeds from insurance recoveries 0 0 0
Net cash provided by (used in) investing activities (1,077) (745) (452)
Cash flows from financing activities:      
Debt repayments   (120,000) (71,000)
Proceeds from issuance of debt   245,500 22,000
Debt issuance costs   (6,332) (819)
Proceeds from exercise of options 11   183
Proceeds from common stock, net of offering costs     65,430
Purchase of treasury stock (549) (533) (124)
Proceeds from (Payments for) Contributions from Affiliates 32,525 (13,454) 16,803
Net cash provided by (used in) financing activities 31,987 105,181 32,473
Net increase (decrease) in cash, cash equivalents and restricted cash (21,037) 63,251 (2,475)
Beginning cash, cash equivalents, and restricted cash 72,385 9,134 11,609
Ending cash, cash equivalents, and restricted cash $ 51,348 $ 72,385 $ 9,134