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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of changes in accumulated other comprehensive income (loss), by component | Changes in accumulated other comprehensive income (loss), by component, were as follows (in thousands):
|  |  | Projected |  |  |  |  |  |  |  |  |  |
|  |  | Pension |  |  |  |  |  |  |  |  |  |
|  |  | Benefit |  | Translation |  |  |  |  |  |
|  |  | Obligation |  | Adjustment |  | Other |  | Total |
Balance at December 31, 2015 |  |  | $ | (3,481) |  | $ | (223) |  | $ | — |  | $ | (3,704) |
Adjust funded status of pension plan, net of tax of $0.7 million |  |  |  | 5,251 |  |  | — |  |  | — |  |  | 5,251 |
Foreign currency translation adjustment |  |  |  | — |  |  | (687) |  |  | — |  |  | (687) |
Unrealized gain on marketable securities |  |  |  | — |  |  | — |  |  | 868 |  |  | 868 |
Balance at December 31, 2016 |  |  |  | 1,770 |  |  | (910) |  |  | 868 |  |  | 1,728 |
Adjust funded status of pension plan, net of tax of $0.7 million |  |  |  | 1,357 |  |  | — |  |  | — |  |  | 1,357 |
Foreign currency translation adjustment |  |  |  | — |  |  | 1,265 |  |  | — |  |  | 1,265 |
Reclassifications of gains on sale of marketable securities to net income |  |  |  | — |  |  | — |  |  | (1,044) |  |  | (1,044) |
Unrealized gain on marketable securities |  |  |  | — |  |  | — |  |  | 440 |  |  | 440 |
Balance at December 31, 2017 |  |  |  | 3,127 |  |  | 355 |  |  | 264 |  |  | 3,746 |
Adjust funded status of pension plan, net of tax of $0.6 million |  |  |  | (840) |  |  | — |  |  | — |  |  | (840) |
Foreign currency translation adjustment |  |  |  | — |  |  | (4,390) |  |  | — |  |  | (4,390) |
Adoption of ASU 2016-01 |  |  |  | — |  |  | — |  |  | (203) |  |  | (203) |
Interest rate swap |  |  |  | — |  |  | — |  |  | 78 |  |  | 78 |
Balance at December 31, 2018 |  |  | $ | 2,287 |  | $ | (4,035) |  | $ | 139 |  | $ | (1,609) |
Schedule of reclassification from accumulated other comprehensive income | Amounts reclassified from accumulated other comprehensive income to net income were as follows (in thousands):
|  |  |  | 2018 |  |  | 2017 |  |  | 2016
Pension and other postretirement benefit plans |  |  | $ | 54 |  | $ | 716 |  | $ | 1,300
Realized gains on marketable securities |  |  |  | — |  |  | (1,044) |  |  | —
Total |  |  | $ | 54 |  | $ | (328) |  | $ | 1,300
Schedule of assets and liabilities of the Company measured at fair value on a recurring basis |
|  |  |  |  | December 31, 2018 |  |  |  |
|  |  |  |  | Significant Other |  |  |  |
|  | Quoted Prices in |  | Observable |  |  |  |
|  | Active Markets |  | Inputs |  |  |  |
Description |  | (Level 1) |  | (Level 2) |  | Total |
Certificates of deposit |  | $ | — |  | $ | 380 |  | $ | 380 |
Money market funds |  |  | 2,266 |  |  | — |  |  | 2,266 |
Short term investments |  |  | 393 |  |  | — |  |  | 393 |
Commercial paper |  |  | — |  |  | 13,972 |  |  | 13,972 |
Interest rate swap |  |  | — |  |  | 140 |  |  | 140 |
Total assets and liabilities measured at fair value |  | $ | 2,659 |  | $ | 14,492 |  | $ | 17,151 |
|  | December 31, 2017 |
|  |  |  |  | Significant Other |  |  |  |
|  | Quoted Prices in |  | Observable |  |  |  |
|  | Active Markets |  | Inputs |  |  |  |
Description |  | (Level 1) |  | (Level 2) |  | Total |
Certificates of deposit |  | $ | — |  | $ | 391 |  | $ | 391 |
Money market funds |  |  | 2,894 |  |  | — |  |  | 2,894 |
Short term investments |  |  | 555 |  |  | 6,521 |  |  | 7,076 |
Commercial paper |  |  | — |  |  | 49,954 |  |  | 49,954 |
Interest rate swap |  |  | — |  |  | 52 |  |  | 52 |
Total assets and liabilities measured at fair value |  | $ | 3,449 |  | $ | 56,918 |  | $ | 60,367 |
Schedule of reconciliation from basic to diluted weighted average common shares outstanding | The reconciliation from basic to diluted weighted average shares of Common Stock outstanding is as follows (in thousands):
|  | Year ended December 31, |
|  | 2018 |  | 2017 |  | 2015 |
Basic weighted-average shares of common stock outstanding |  | 15,988 |  | 16,138 |  | 16,131 |
Stock options |  | 54 |  | 72 |  | 96 |
Diluted weighted-average shares of common stock outstanding |  | 16,042 |  | 16,210 |  | 16,227 |
Schedule of anti-dilutive potential shares that were excluded from the computation of diluted weighted average shares outstanding | The following notes the number of potential shares of common stock not included in the above calculation because the effects of such were anti‑dilutive (in thousands of shares):
|  | For the Year Ended |
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Stock options |  | 5 |  | 7 |  | 5 |
Total |  | 5 |  | 7 |  | 5 |
Accounting Standards Update 2016-15 and 2018-18 |
Summary of changes to the Company’s financial statements as a result of the adoption | The adoption of ASU 2016-15 and ASU 2016-18 impacted the Company’s cash flows for the years ended December 31, 2017 and December 31, 2016 as indicated below (amounts in thousands):
|  | Statement of Cash flows |
|  | Year ended December 31, 2017 |  |  | Year ended December 31, 2016 |
|  | Reported |  | Change |  | Under previous guidance |  |  | Reported |  | Change |  | Under previous guidance |
Net cash provided by operating activities | $ | 145,725 | $ | — | $ | 145,725 |  | $ | 111,656 | $ | — | $ | 111,656 |
Net cash used in investing activities |  | (172,318) |  | 5,525 |  | (166,793) |  |  | (296,580) |  | (12,108) |  | (308,688) |
Net cash used in financing activities |  | (42,101) |  | 1,178 |  | (40,923) |  |  | 75,334 |  | — |  | 75,334 |
Effect of foreign currency exchange rates on total cash |  | 226 |  | — |  | 226 |  |  | (626) |  | — |  | (626) |
Net change in total cash | $ | (68,468) | $ | 6,703 | $ | (61,765) |  | $ | (110,216) | $ | (12,108) | $ | (122,324) |
Total cash, beginning of period |  | 288,358 |  | (18,637) |  | 269,721 |  |  | 398,574 |  | (6,529) |  | 392,045 |
Total cash, end of period | $ | 219,890 | $ | (11,934) | $ | 207,956 |  | $ | 288,358 | $ | (18,637) | $ | 269,721 |

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