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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Cash flows from operating activities |  |  |
Net income | $ 73,923 | $ 78,275 | $ 53,538
Adjustment to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 41,166 | 44,889 | 50,218
Amortization of contract acquisition costs | 1,017 | 1,680 | 5,267
Amortization of debt issuance costs | 808 | 589 | 672
Imputed interest expense | 904 | 544 | 132
Provision for doubtful accounts | 368 | 363 | 600
Loss (gain) on disposal of assets | 305 | (415) | (617)
Impairment losses | 2,958 | 230 | 1,958
Deferred income taxes | 2,354 | 1,658 | (3,030)
Excess tax benefit from equity-based awards | (462) | (6,491) | (1,783)
Equity-based compensation expense | 13,376 | 15,856 | 13,372
(Gain) loss on foreign currency derivatives | 414 | 1,073 | (128)
Gain on Newgen legal settlement, net of tax | 0 | 0 | (3,542)
Changes in assets and liabilities, net of acquisitions: |  |  |
Accounts receivable | 400 | (5,789) | (87)
Prepaids and other assets | (25,664) | 3,578 | 17,664
Accounts payable and accrued expenses | (16,301) | (16,502) | 19,683
Deferred revenue and other liabilities | 11,354 | (5,739) | (19,462)
Net cash provided by operating activities | 106,920 | 113,799 | 134,455
Cash flows from investing activities |  |  |
Proceeds from sale of long-lived assets | 450 | 2,034 | 0
Proceeds from grant for property, plant and equipment | 110 | 357 | 0
Purchases of property, plant and equipment | (40,653) | (38,667) | (26,800)
Payment of contract acquisition costs | 0 | 1,758 | 0
Investment in deconsolidated subsidiary | 0 | 0 | (3,600)
Deposit on pending acquisition | 0 | 3,026 | 0
Acquisitions, net of cash acquired of $3,741, $14 and $2,202, respectively | (40,839) | (45,871) | (12,798)
Net cash used in investing activities | (80,932) | (86,931) | (43,198)
Cash flows from financing activities |  |  |
Proceeds from line of credit | 1,179,850 | 678,200 | 1,257,100
Payments on line of credit | (1,135,850) | (614,200) | (1,257,100)
Proceeds from other debt | 8,014 | 0 | 0
Payments on other debt | (4,900) | (2,099) | (3,749)
Dividends distributed to noncontrolling interest | (2,205) | (3,548) | (4,140)
Proceeds from exercise of stock options | 1,374 | 14,762 | 2,792
Excess tax benefit from equity-based awards | 462 | 6,491 | 1,783
Purchase of treasury stock | (81,243) | (63,693) | (80,295)
Payments of debt issuance costs | (467) | (22) | (2,288)
Net cash provided by (used in) financing activities | (34,965) | 15,891 | (85,897)
Effect of exchange rate changes on cash and cash equivalents | 17,091 | (5,773) | 4,601
Increase in cash and cash equivalents | 8,114 | 36,986 | 9,961
Cash and cash equivalents, beginning of period | 156,371 | 119,385 | 109,424
Cash and cash equivalents, end of period | 164,485 | 156,371 | 119,385
Supplemental disclosures |  |  |
Cash paid for interest | 4,412 | 4,013 | 2,217
Cash paid for income taxes | 16,388 | 24,336 | 15,593
Non-cash investing and financing activities |  |  |
Purchases of equipment through financing arrangements | 6,100 | 0 | 186
Landlord incentives credited to deferred rent | 1,723 | 0 | 810
Grant income credited to property, plant and equipment | 0 | 110 | 0
Recognition of asset retirement obligations | $ 0 | $ 278 | $ 406

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- Definition The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585 + Details
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