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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of advertising costs expensed |
Years ended December 31, | 2017 |  | 2016 |  | 2015
(in thousands) |  |  |  |  |
Advertising | $ | 66,115 |  |  | $ | 61,258 |  |  | $ | 57,705 |
Schedule of cash and cash equivalents |
At December 31, | 2017 |  | 2016
(in thousands) (in US dollars) |  |  |
Cash held in foreign bank accounts | $ | 57,790 |  |  | $ | 54,424 |
Schedule of depreciation |
Years ended December 31, | 2017 |  | 2016 |  | 2015
(in thousands) |  |  |  |  |
Depreciation | $ | 27,381 |  |  | $ | 24,725 |  |  | $ | 19,354 |
Reconciliation of weighted average shares outstanding along with the earnings per share attributable to restricted shares of common stock (participating securities) | A reconciliation of weighted average shares outstanding along with the earnings per share attributable to restricted shares of common stock (participating securities) is as follows (in thousands except per share data). All share and per share information in the following chart are restated for the stock split effective March 10, 2015:
Years Ended December 31, | 2017 |  | 2016 |  | 2015
Net income available to stockholders | $ | 179,124 |  |  | $ | 167,369 |  |  | $ | 152,149 |
Less: Dividends paid |  |  |  |  |  |  |  |
Common Stock | (120,930 | ) |  | (107,880 | ) |  | (90,631 | )
Restricted shares of common stock | (1,087 | ) |  | (1,122 | ) |  | (1,124 | )
Undistributed earnings for the period | $ | 57,107 |  |  | $ | 58,367 |  |  | $ | 60,394 |
Allocation of undistributed earnings: |  |  |  |  |  |  |  |
Common stock | $ | 56,567 |  |  | $ | 57,722 |  |  | $ | 59,611 |
Restricted shares of common stock | 540 |  |  | 645 |  |  | 783 |
Basic and diluted shares outstanding: |  |  |  |  |  |  |  |
Common stock | 215,927 |  |  | 215,831 |  |  | 215,749 |
Restricted shares of common stock | 2,061 |  |  | 2,413 |  |  | 2,834 |
| 217,988 |  |  | 218,244 |  |  | 218,583 |
Basic and diluted earnings per share: |  |  |  |  |  |  |  |
Common stock: |  |  |  |  |  |  |  |
Distributed earnings | $ | 0.56 |  |  | $ | 0.50 |  |  | $ | 0.42 |
Undistributed earnings | 0.26 |  |  | 0.27 |  |  | 0.28 |
| $ | 0.82 |  |  | $ | 0.77 |  |  | $ | 0.70 |
Restricted shares of common stock |  |  |  |  |  |  |  |
Distributed earnings | $ | 0.53 |  |  | $ | 0.46 |  |  | $ | 0.40 |
Undistributed earnings | 0.26 |  |  | 0.27 |  |  | 0.28 |
| $ | 0.79 |  |  | $ | 0.73 |  |  | $ | 0.68 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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