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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Cash flows from operating activities: |  |
Net loss | $ (25,963) | $ (19,428)
Adjustments to reconcile net loss to net cash flows from operating activities: |  |
Depreciation | 5,901 | 5,926
Amortization | 18,951 | 19,067
Amortization of operating lease right-of-use assets | 3,383 |
Amortization of deferred debt issuance costs | 753 | 699
Deferred income taxes | (17,414) | (4,827)
Stock-based compensation expense | 6,585 | 6,362
Other | 574 | (663)
Changes in operating assets and liabilities |  |
Receivables | 94,549 | 68,741
Accounts payable | (10,297) | (2,611)
Accrued employee compensation | (8,598) | (14,743)
Current income taxes | (1,041) | (3,569)
Deferred revenue | (4,127) | 11,326
Other current and noncurrent assets and liabilities | (20,829) | (21,144)
Net cash flows from operating activities | 42,427 | 45,136
Cash flows from investing activities: |  |
Purchases of property and equipment | (5,250) | (5,937)
Purchases of software and distribution rights | (4,578) | (6,652)
Net cash flows from investing activities | (9,828) | (12,589)
Cash flows from financing activities: |  |
Proceeds from issuance of common stock | 831 | 753
Proceeds from exercises of stock options | 4,857 | 9,118
Repurchase of restricted share awards and restricted share units for tax withholdings | (2,624) | (914)
Repurchases of common stock | (631) | (31,113)
Proceeds from revolving credit facility |  | 48,000
Repayment of revolving credit facility |  | (50,000)
Repayment of term portion of credit agreement | (5,937) | (5,187)
Payments on other debt | (1,857) | (352)
Net cash flows from financing activities | (5,361) | (29,695)
Effect of exchange rate fluctuations on cash | 433 | 1,719
Net increase in cash and cash equivalents | 27,671 | 4,571
Cash and cash equivalents, beginning of period | 148,502 | 69,710
Cash and cash equivalents, end of period | 176,173 | 74,281
Supplemental cash flow information |  |
Income taxes paid | 5,949 | 8,263
Interest paid | $ 14,388 | $ 13,127

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