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Condensed Consolidating Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities $ 341,325 $ 375,373 $ 399,798
Net cash used in investing activities (124,562) (122,188) (409,281)
Net cash provided by (used in) financing activities (202,291) (280,765) 381
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 14,472 (27,580) (9,102)
CASH AND CASH EQUIVALENTS, beginning of year 37,711 65,291 74,393
CASH AND CASH EQUIVALENTS, end of year 52,183 37,711 65,291
Reportable Legal Entities | Parent      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 276,055 295,366 102,371
Net cash used in investing activities (55,242) (19,317) (93,891)
Net cash provided by (used in) financing activities (206,446) (280,337) (5,151)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 14,367 (4,288) 3,329
CASH AND CASH EQUIVALENTS, beginning of year 11,378 15,666 12,337
CASH AND CASH EQUIVALENTS, end of year 25,745 11,378 15,666
Reportable Legal Entities | Combined Subsidiary Guarantors      
Condensed Financial Statements, Captions [Line Items]      
Net cash provided by operating activities 65,270 80,007 297,427
Net cash used in investing activities (69,320) (69,571) (212,215)
Net cash provided by (used in) financing activities 4,155 (33,728) (97,643)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 105 (23,292) (12,431)
CASH AND CASH EQUIVALENTS, beginning of year 26,333 49,625 62,056
CASH AND CASH EQUIVALENTS, end of year $ 26,438 26,333 49,625
Consolidating Adjustments and Other      
Condensed Financial Statements, Captions [Line Items]      
Net cash used in investing activities   (33,300) (103,175)
Net cash provided by (used in) financing activities   $ 33,300 $ 103,175