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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net income | $ 14,551 | $ 8,447
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |
Depreciation | 2,314 | 2,130
Amortization | 7,391 | 9,448
Stock-based compensation expense | 1,467 | 1,034
Amortization of debt issuance costs and discount | 159 | 165
Deferred income tax benefit | (248) | (410)
Amortization and adjustment of deferred credit | (203) | 0
Other | (32) | (252)
Changes in assets and liabilities: |  |
Accounts receivable and unbilled, net | (17,760) | (2,292)
Prepaid expenses and other current assets | (214) | (247)
Accounts payable | 699 | (1,331)
Accrued expenses | 5,268 | (10,508)
Pre-funded study costs | 0 | (3,497)
Advanced billings | 6,817 | (5,246)
Other assets and liabilities, net | 3,089 | 1,884
Net cash provided by (used in) operating activities | 23,298 | (675)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Property and equipment expenditures | (3,951) | (4,374)
Other | 23 | 16
Net cash used in investing activities | (3,928) | (4,358)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Proceeds from stock option exercises | 566 | 193
Payment of debt | (4,125) | (3,094)
Payments on revolving loan | (20,000) | 0
Payment of deemed landlord liability | (451) | (404)
Net cash used in financing activities | (24,010) | (3,305)
EFFECT OF EXCHANGE RATES ON CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | 400 | 540
DECREASE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH | (4,240) | (7,798)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — Beginning of period | 26,492 | 37,407
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH — End of period | $ 22,252 | $ 29,609

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