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Guarantor/Non Guarantor Condensed Consolidating Financial Statements (Cash Flows)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Cash flows from operating activities $ 12,022 $ 39,655
Cash flows from investing activities:    
Purchases of property and equipment (50,046) (67,148)
Proceeds from sale of property and equipment 7,733 5,864
Proceeds from insurance recoveries 1,469 1,082
Net cash provided by (used in) investing activities (40,844) (60,202)
Cash flows from financing activities:    
Proceeds from exercise of options 0 12
Purchase of treasury stock (125) (549)
Intercompany contributions/distributions 0 0
Net cash provided by (used in) financing activities (125) (537)
Net increase (decrease) in cash, cash equivalents and restricted cash (28,947) (21,084)
Beginning cash, cash equivalents, and restricted cash 54,564 75,648
Ending cash, cash equivalents, and restricted cash 25,617 54,564
Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cash flows from operating activities 0 0
Cash flows from investing activities:    
Purchases of property and equipment 0 0
Proceeds from sale of property and equipment 0 0
Proceeds from insurance recoveries 0 0
Net cash provided by (used in) investing activities 0 0
Cash flows from financing activities:    
Proceeds from exercise of options   0
Purchase of treasury stock 0 0
Intercompany contributions/distributions 0 0
Net cash provided by (used in) financing activities 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0
Beginning cash, cash equivalents, and restricted cash 0 0
Ending cash, cash equivalents, and restricted cash 0 0
Guarantor Subsidiaries [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cash flows from operating activities 81,945 84,663
Cash flows from investing activities:    
Purchases of property and equipment (44,555) (59,478)
Proceeds from sale of property and equipment 7,619 5,826
Proceeds from insurance recoveries 641 1,066
Net cash provided by (used in) investing activities (36,295) (52,586)
Cash flows from financing activities:    
Proceeds from exercise of options   0
Purchase of treasury stock 0 0
Intercompany contributions/distributions (45,650) (32,077)
Net cash provided by (used in) financing activities (45,650) (32,077)
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0
Beginning cash, cash equivalents, and restricted cash 0 0
Ending cash, cash equivalents, and restricted cash 0 0
Non-Guarantor Subsidiaries [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cash flows from operating activities 11,102 6,940
Cash flows from investing activities:    
Purchases of property and equipment (4,677) (6,593)
Proceeds from sale of property and equipment 114 38
Proceeds from insurance recoveries 828 16
Net cash provided by (used in) investing activities (3,735) (6,539)
Cash flows from financing activities:    
Proceeds from exercise of options   0
Purchase of treasury stock 0 0
Intercompany contributions/distributions (425) (448)
Net cash provided by (used in) financing activities (425) (448)
Net increase (decrease) in cash, cash equivalents and restricted cash 6,942 (47)
Beginning cash, cash equivalents, and restricted cash 3,216 3,263
Ending cash, cash equivalents, and restricted cash 10,158 3,216
Parent [Member]    
Condensed Financial Statements, Captions [Line Items]    
Cash flows from operating activities (81,025) (51,948)
Cash flows from investing activities:    
Purchases of property and equipment (814) (1,077)
Proceeds from sale of property and equipment 0 0
Proceeds from insurance recoveries 0 0
Net cash provided by (used in) investing activities (814) (1,077)
Cash flows from financing activities:    
Proceeds from exercise of options   12
Purchase of treasury stock (125) (549)
Intercompany contributions/distributions 46,075 32,525
Net cash provided by (used in) financing activities 45,950 31,988
Net increase (decrease) in cash, cash equivalents and restricted cash (35,889) (21,037)
Beginning cash, cash equivalents, and restricted cash 51,348 72,385
Ending cash, cash equivalents, and restricted cash $ 15,459 $ 51,348