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Supplemental Guarantor Financial Information - Cash Flows (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities     $ 184,582 $ 172,434
Additions to property and equipment $ (26,675) $ (41,556) (73,357) (111,424)
Acquisitions, net of cash acquired       (484,602)
Net cash used in investing activities     (73,357) (596,026)
Proceeds from borrowings under revolving credit facility     478,023 968,365
Tax payments related to share-based compensation     (5,245) (8,359)
Repayments of borrowings under revolving credit facility     (569,017) (827,351)
Proceeds from borrowings of long-term debt       300,000
Debt issuance, modification and redemption costs       (5,476)
Proceeds from exercises of stock options     14 105
Net cash (used in) provided by financing activities     (96,225) 427,284
Effect of exchange rate changes on cash, cash equivalents, and restricted cash     (404) (4,178)
Net increase (decrease) in cash, cash equivalents and restricted cash     14,596 (486)
Cash, cash equivalents and restricted cash at beginning of period     99,817 105,747
Cash, cash equivalents and restricted cash at end of period 114,413 105,261 114,413 105,261
Parent [Member] | Reportable Legal Entities [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities     5,230 8,534
Tax payments related to share-based compensation     (5,245) (8,359)
Proceeds from exercises of stock options     14 105
Net cash (used in) provided by financing activities     (5,231) (8,254)
Net increase (decrease) in cash, cash equivalents and restricted cash     (1) 280
Cash, cash equivalents and restricted cash at beginning of period     88 101
Cash, cash equivalents and restricted cash at end of period 87 381 87 381
Issuer | Reportable Legal Entities [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities     4,400 20,602
Proceeds from borrowings under revolving credit facility     273,700 295,400
Repayments of borrowings under revolving credit facility     (278,100) (319,200)
Net cash (used in) provided by financing activities     (4,400) (23,800)
Net increase (decrease) in cash, cash equivalents and restricted cash       (3,198)
Cash, cash equivalents and restricted cash at beginning of period     7 3,205
Cash, cash equivalents and restricted cash at end of period 7 7 7 7
Guarantors [Member] | Reportable Legal Entities [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities     142,552 120,702
Additions to property and equipment     (45,335) (66,200)
Acquisitions, net of cash acquired       (465,123)
Net cash used in investing activities     (45,335) (531,323)
Proceeds from borrowings under revolving credit facility     37,445 601,672
Repayments of borrowings under revolving credit facility     (110,333) (446,533)
Proceeds from borrowings of long-term debt       300,000
Debt issuance, modification and redemption costs       (5,476)
Intercompany financing     (4,241) (7,642)
Net cash (used in) provided by financing activities     (77,129) 442,021
Effect of exchange rate changes on cash, cash equivalents, and restricted cash     (227) (15,974)
Net increase (decrease) in cash, cash equivalents and restricted cash     19,861 15,426
Cash, cash equivalents and restricted cash at beginning of period     50,433 34,722
Cash, cash equivalents and restricted cash at end of period 70,294 50,148 70,294 50,148
Non-Guarantors [Member] | Reportable Legal Entities [Member]        
Condensed Cash Flow Statements, Captions [Line Items]        
Net cash provided by operating activities     32,400 22,596
Additions to property and equipment     (28,022) (45,224)
Acquisitions, net of cash acquired       (19,479)
Net cash used in investing activities     (28,022) (64,703)
Proceeds from borrowings under revolving credit facility     166,878 71,293
Repayments of borrowings under revolving credit facility     (180,584) (61,618)
Intercompany financing     4,241 7,642
Net cash (used in) provided by financing activities     (9,465) 17,317
Effect of exchange rate changes on cash, cash equivalents, and restricted cash     (177) 11,796
Net increase (decrease) in cash, cash equivalents and restricted cash     (5,264) (12,994)
Cash, cash equivalents and restricted cash at beginning of period     49,289 67,719
Cash, cash equivalents and restricted cash at end of period $ 44,025 $ 54,725 $ 44,025 $ 54,725