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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 | $ 67,953 | $ 58,178 | $ 43,458
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 21,575 | 16,340 | 8,572
Deferred taxes | 8,786 | 18,821 | 9,545
Compensation expense related to share-based compensation plans | 6,539 | 4,788 | 3,576
Loss (gain) on sale of assets | 108 | (17) | 85
Excess tax benefits from share based compensation | (29) |  |
Changes in operating assets and liabilities, net of effects of acquisitions: |  |  |
Restricted investments | (2,895) | (724) | (1,838)
Accounts receivable, net | (22,429) | (45,047) | (46,582)
Prepaid taxes | 2,253 | (2,097) | 298
Prepaid expenses and other current assets | (1,562) | (1,728) | 233
Other assets | 459 | (33) | 298
Accounts payable | 7,438 | 23,095 | 12,822
Accrued expenses | 2,779 | 2,989 | 5,277
Non-current liabilities | 1,942 | 301 | 1,910
Net cash provided by operating activities | 92,917 | 74,866 | 37,654
Cash flows from investing activities: |  |  |
Proceeds from sale of equipment | 1,071 | 410 | 988
Purchases of property and equipment | (56,882) | (55,010) | (25,616)
Cash used in acquisitions, net of cash acquired | (550) | (85,182) | (170)
Net cash used in investing activities | (56,361) | (139,782) | (24,798)
Cash flows from financing activities: |  |  |
Proceeds from stock options exercised | 69 | 86 | 46
Purchase of treasury stock | (13,020) | (1,523) | (25,070)
Capital lease payments | (2,454) | (729) |
Excess tax benefits from share-based compensation | 523 | 1,034 | 434
Net cash used in financing activities | (14,882) | (1,132) | (24,590)
Effect of exchange rate changes on cash and cash equivalents | (5) | (5) | 15
Net increase (decrease) in cash and cash equivalents | 21,669 | (66,053) | (11,719)
Cash and cash equivalents beginning of the year | 49,091 | 115,144 | 126,863
Cash and cash equivalents end of the year | 70,760 | 49,091 | 115,144
Supplemental disclosures of cash paid for: |  |  |
Interest | 1,200 | 541 | 54
Income taxes | $ 28,638 | $ 18,629 | $ 16,031

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