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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Table) (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Investment [Line Items] |  |  |  |  |
Number of Stores | 206 | 206 | 189 |  |
Available-for-sale Securities, Gross Realized Gain (Loss) |  | $ 5,000 | $ (661,000) | $ 67,000 |
Translation Adjustment Functional to Reporting Currency, Net of Tax | $ (24,798,000) | (24,798,000) | (31,634,000) |  |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax |  | (623,000) | 191,000 |  |
Unrealized Gain (Loss) on Investments |  | (192,000) | (308,000) |  |
Accumulated other comprehensive loss | (25,613,000) | (25,613,000) | (31,751,000) | $ (31,413,000) | $ (12,752,000)
Available-for-sale Securities, Gross Unrealized Gain |  | 106,000 |  |  |
Available-for-sale Securities, Gross Realized Gains | 3,000 | 1,000 | 279,000 |  |
Investment Maturity Date Range One Year Or Less [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Financial Instruments, Owned, Corporate Debt, at Fair Value | 11,979,000 | 11,979,000 | 11,527,000 |  |
Certificates of Deposit, at Carrying Value | 52,048,000 | 52,048,000 | 27,968,000 |  |
Marketable Securities | 64,027,000 | 64,027,000 | 39,495,000 |  |
Investment Maturity Date Range One To Eight Years [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Financial Instruments, Owned, Corporate Debt, at Fair Value | 29,523,000 | 29,523,000 | 70,559,000 |  |
Certificates of Deposit, at Carrying Value | 0 | 0 | 0 |  |
Marketable Securities | $ 29,523,000 | 29,523,000 | 70,559,000 |  |
Other Long-term Investments [Member] |  |  |  |  |
Investment [Line Items] |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain |  | $ 90,000 | 118,000 |  |
Available-for-sale Securities, Gross Realized Gains |  |  | $ 89,000 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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