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Condensed Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income | $ 119,138,000 | $ 121,274,000 | $ 113,655,000
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Stock-based compensation | 20,847,000 | 19,509,000 | 18,698,000
Tax benefit from stock based compensation | 0 | 0 | (10,510,000)
Depreciation and amortization | 21,389,000 | 21,102,000 | 20,757,000
Loss on disposal of fixed assets | 1,455,000 | 652,000 | 1,780,000
Goodwill, Impairment Loss | 1,000,000 | 0 | 3,045,000
Deferred taxes | (19,274,000) | (6,588,000) | 7,271,000
Accrued interest on note receivable – related party | (55) | (63) | (71)
Increase (Decrease) in Accrued Interest Receivable, Net | 54,000 | 63,000 | 71,000
Repayment of Notes Receivable from Related Parties | 409,000 | 409,000 | 409,000
Deferred rent expense | 1,455,000 | 2,565,000 | 440,000
Loss (gain) on sale of marketable securities | (5,000) | 661,000 | (67,000)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (11,206,000) | (425,000) | (5,576,000)
Provision for Doubtful Accounts | 5,470,000 | 0 | 0
Changes in: |  |  |
Accounts receivable | 22,683,000 | (13,617,000) | (11,071,000)
Due from factor | (57,268,000) | 11,043,000 | 7,281,000
Inventories | 21,135,000 | (17,744,000) | (9,403,000)
Prepaid expenses, prepaid taxes, deposits and other | 2,403,000 | (3,461,000) | 4,784,000
Accounts payable and accrued expenses | 9,501,000 | 15,324,000 | (8,643,000)
Accrued incentive compensation | 2,507,000 | 1,819,000 | 468,000
Other liabilities | 16,350,000 | 1,144,000 | 2,716,000
Net cash provided by operating activities | 157,935,000 | 153,604,000 | 135,963,000
Cash flows from investing activities: |  |  |
Purchases of property and equipment | (14,775,000) | (15,897,000) | (19,459,000)
Purchases of marketable securities | (61,209,000) | (40,451,000) | (48,891,000)
Proceeds from Collection of Notes Receivable | 221,000 | 249,000 | 466,000
Maturity/sale of marketable securities | 79,141,000 | 52,215,000 | 43,353,000
Acquisitions | (16,795,000) | 0 | (9,129,000)
Net cash used in investing activities | (13,417,000) | (3,884,000) | (33,660,000)
Cash flows from financing activities: |  |  |
Proceeds from exercise of stock options | 16,433,000 | 10,713,000 | 21,301,000
Payments to Acquire Businesses, Gross | 0 | (3,759,000) | 0
Tax benefit from the exercise of options | 0 | 0 | 10,510,000
business combinations contingent liability payment | (7,359,000) | (16,402,000) | (6,270,000)
Common stock purchased for treasury | (99,412,000) | (86,005,000) | (135,637,000)
Net cash provided by financing activities | (90,338,000) | (95,453,000) | (110,096,000)
Effect of Exchange Rate on Cash and Cash Equivalents | 919,000 | (566,000) | (1,243,000)
Net decrease in cash and cash equivalents | 55,099,000 | 53,701,000 | (9,036,000)
Cash and cash equivalents – beginning of period | 126,115,000 | 72,414,000 | 81,450,000
Cash and cash equivalents – end of period | 181,214,000 | 126,115,000 | 72,414,000
Cash paid during the year for: |  |  |
Interest | 24,000 | 222,000 | 328,000
Income taxes | $ 61,979,000 | $ 55,384,000 | $ 39,424,000

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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions. + References No definition available. + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: 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=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: 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=98514028&loc=d3e3602-108585 + Details
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- Definition Difference between actual rental income due and rental income recognized on a straight-line basis. + References Reference 1: 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=98514028&loc=d3e3602-108585 + Details
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