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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Cash Flows from Operating Activities: |  |
Net income | $ 76,857 | $ 49,994
Loss from discontinued operations |  | 91
Adjustments to reconcile net income to net cash provided by (used in) operating activities - |  |
Depreciation | 31,880 | 29,026
Amortization of intangible assets | 5,301 | 9,165
Amortization of debt issuance costs | 218 | 223
Amortization of deferred revenues | (2,505) | (2,586)
(Gain) loss on sale of property and equipment | (282) | 137
Foreign currency (gain) loss | 502 | (273)
Provision for doubtful accounts | 1,508 | 1,736
Deferred income tax provision (benefit) | (1,122) | 4,988
Non-cash stock-based compensation | 8,036 | 5,889
Tax impact of stock-based equity awards |  | (2,910)
Changes in operating assets and liabilities, net of non-cash transactions - (Increase) decrease in - |  |
Accounts and notes receivable | 30,843 | (38,591)
Costs and estimated earnings in excess of billings on uncompleted contracts | (65,030) | (103,391)
Inventories | 497 | 3,202
Prepaid expenses and other current assets | 13,548 | 6,868
Increase (decrease) in - |  |
Accounts payable and accrued expenses and other non-current liabilities | (47,634) | (45,535)
Billings in excess of costs and estimated earnings on uncompleted contracts | (10,504) | 10,929
Other, net | 2,019 | (2,443)
Net cash provided by (used in) operating activities of continuing operations | 44,132 | (73,481)
Cash Flows from Investing Activities: |  |
Proceeds from sale of property and equipment | 1,544 | 613
Additions of property and equipment | (57,637) | (31,868)
Cash paid for acquisitions, net of cash acquired | (977) | (41,904)
Investments in unconsolidated affiliates | (8,545) | (4,906)
Net cash used in investing activities of continuing operations | (65,615) | (78,065)
Cash Flows from Financing Activities: |  |
Distributions to noncontrolling interests | (5,454) | (2,490)
Tax impact of stock-based equity awards |  | 2,910
Exercise of stock options | 497 | 479
Net cash provided by (used in) financing activities of continuing operations | (4,957) | 899
Discontinued operations: |  |
Net cash provided by operating activities |  | 13,263
Net cash used in investing activities |  | (2,890)
Net cash provided by discontinued operations |  | 10,373
Effect of foreign exchange rate changes on cash and cash equivalents | (1,642) | 2,292
Net decrease in cash and cash equivalents | (28,082) | (137,982)
Cash and cash equivalents, beginning of period | 394,701 | 315,349
Cash and cash equivalents, end of period | 366,619 | 177,367
Cash (paid) received during the period for - |  |
Interest paid | (462) | (356)
Income taxes paid | (91,581) | (47,594)
Income tax refunds | $ 6 | $ 1,305

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- Definition The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet 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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