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Derivatives (Foreign Exchange Contracts) (Details) € in Thousands, ₨ in Thousands, £ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 EUR (€) | Jun. 30, 2017 GBP (£) | Jun. 30, 2017 INR (₨)
Derivative [Line Items] |  |  |  |  |  |  |
Foreign currency transaction gain (loss) | $ 100 | $ (100) | $ 100 | $ (100) |  |  |
Sells Indian rupee (INR)/Buys USD Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount | 5,344 |  | 5,344 |  |  |  | ₨ 350,000
Sells euro (EUR)/Buys USD Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount | 7,496 |  | 7,496 |  | € 7,000 |  |
Sells pound sterling (GBP)/Buys USD Forward |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional Amount | $ 3,988 |  | $ 3,988 |  |  | £ 3,200 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
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