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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 28,954 | $ 19,198
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 2,453 | 1,991
Amortization | 1,997 | 5,844
Stock-based compensation expense | 5,445 | 3,183
Amortization of debt issuance costs and discount | 0 | 138
Noncash lease expense | 2,917 | 2,363
Deferred income tax provision | 1,079 | 656
Amortization and adjustment of deferred credit | (181) | (200)
Other | (67) | (43)
Changes in assets and liabilities: |  |
Accounts receivable and unbilled, net | 19,301 | 4,255
Prepaid expenses and other current assets | (2,694) | (1,642)
Accounts payable | (6,809) | (2,684)
Accrued expenses | (1,757) | (5,221)
Advanced billings | (2,695) | 2,437
Lease liabilities | (2,236) | (2,041)
Other assets and liabilities, net | 3,441 | 5,771
Net cash provided by operating activities | 49,148 | 34,005
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Property and equipment expenditures | (5,561) | (2,520)
Other | 39 | (1,322)
Net cash used in investing activities | (5,522) | (3,842)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from stock option exercises | 1,331 | 972
Repurchases of common stock | (41,776) | 0
Payment of debt | 0 | (24,000)
Net cash used in financing activities | (40,445) | (23,028)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | (1,102) | (290)
INCREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 2,079 | 6,845
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period | 131,920 | 23,282
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period | $ 133,999 | $ 30,127

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