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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash flow from operating activities:      
Net income $ 328,864 $ 130,996 $ 42,862
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 237,189 228,683 150,834
Stock-based compensation expense 41,487 50,564 44,079
Income tax benefit related to exercise of stock options   (46,207) (32,960)
Amortization and write-offs of loan origination costs 10,552 10,680 8,126
Loss on extinguishment of debt 963   3,954
Loss on sale or disposition of property and equipment 901 162 336
Deferred income taxes (152,012) (47,836) (39,806)
Provision for doubtful accounts 2,411 3,486 1,137
Changes in operating assets and liabilities, excluding effects from acquisitions:      
Accounts receivable (1,848) (10,850) (12,160)
Prepaid expenses and other assets (7,342) (2,844) (6,019)
Accounts payable 13,841 (1,300) (5,586)
Accrued expenses (14,806) 20,679 4,073
Income taxes prepaid and payable 45,640 65,117 11,514
Deferred revenue (35,478) 17,077 60,240
Net cash provided by operating activities 470,362 418,407 230,624
Cash flow from investing activities:      
Additions to property and equipment (35,570) (27,926) (13,600)
Proceeds from sale of property and equipment 4 71 64
Cash paid for business acquisitions, net of cash acquired (Note 11) (17,413) (457,511) (2,729,153)
Additions to capitalized software (10,404) (9,621) (4,273)
Purchase of long-term investment   (1,000)  
Net cash used in investing activities (63,383) (495,987) (2,746,962)
Cash flow from financing activities:      
Cash received from debt borrowings, net of original issue discount 45,000 120,000 3,068,075
Repayments of debt (512,450) (383,436) (903,448)
Proceeds from exercise of stock options 60,219 39,239 30,092
Withholding taxes paid related to equity award net share settlement (4,825) (7,430) (6,939)
Income tax benefit related to exercise of stock options   46,207 32,960
Proceeds from common stock issuance, net     717,802
Purchase of common stock for treasury   (15)  
Payment of fees related to refinancing activities   (519) (46,025)
Dividends paid on common stock (54,357) (50,140) (45,451)
Net cash (used in) provided by financing activities (466,413) (236,094) 2,847,066
Effect of exchange rate changes on cash, cash equivalents and restricted cash 4,409 (3,629) (4,805)
Net (decrease) increase in cash, cash equivalents and restricted cash (55,025) (317,303) 325,923
Cash, cash equivalents and restricted cash, beginning of period 119,674 436,977 111,054
Cash, cash equivalents and restricted cash, end of period 64,649 119,674 436,977
Supplemental disclosure of cash paid for:      
Interest 102,703 126,693 42,221
Income taxes, net of refunds 67,607 8,809 $ 42,210
Supplemental disclosure of non-cash investing activities:      
Property and equipment acquired through tenant improvement allowances $ 10,334 $ 2,818