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Consolidated Statement Of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Operating activities |  |  |
Net income | $ 278,000 | $ 214,945 | $ 178,981
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 84,130 | 74,938 | 68,921
Deferred income tax provision (benefit) | (18,057) | 11,935 | 10,479
Loss on disposal of assets | 5,027 | 5,806 | 6,296
Bad debt allowance | 1,046 | 239 | (151)
Stock-based compensation expense | 64,276 | 41,382 | 21,381
Excess tax benefit on stock-based compensation | (73,210) | (38,786) | (14,526)
Other | 522 | 2,501 |
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (9,438) | (2,970) | (743)
Inventory | (2,180) | (1,816) | (1,481)
Prepaid expenses and other current assets | (5,954) | (5,399) | (1,632)
Other assets | (20,539) | (7,350) | (8,956)
Accounts payable | 7,849 | 9,432 | 6,989
Accrued liabilities | 21,307 | 17,451 | 16,607
Income tax payable/receivable | 59,357 | 66,555 | (13,209)
Deferred rent | 23,765 | 19,624 | 17,261
Other long-term liabilities | 4,062 | 2,609 | 2,974
Net cash provided by operating activities | 419,963 | 411,096 | 289,191
Investing activities |  |  |
Purchases of leasehold improvements, property and equipment | (197,037) | (151,147) | (113,215)
Acquisition of interests in equity method investment |  | (586) | (1,900)
Purchases of investments | (213,462) | (183,251) | (125,000)
Maturities of investments | 55,000 | 124,766 | 50,234
Net cash used in investing activities | (355,499) | (210,218) | (189,881)
Financing activities |  |  |
Acquisition of treasury stock | (217,092) | (63,508) | (126,602)
Proceeds from employee stock plan transactions | 481 | 574 | 17,650
Excess tax benefit on stock-based compensation | 73,210 | 38,786 | 14,526
Payments on deemed landlord financing | (133) | (120) | (96)
Net cash used in financing activities | (143,534) | (24,268) | (94,522)
Effect of exchange rate changes on cash and cash equivalents | 380 | (205) | 484
Net change in cash and cash equivalents | (78,690) | 176,405 | 5,272
Cash and cash equivalents at beginning of period | 401,243 | 224,838 | 219,566
Cash and cash equivalents at end of period | 322,553 | 401,243 | 224,838
Supplemental disclosures of cash flow information |  |  |
Income taxes paid | 138,385 | 56,270 | 112,150
Increase in purchases of leasehold improvements, property and equipment accrued in accounts payable | $ 4,455 | $ 3,249 | $ 1,480

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