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Derivative Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
Derivative Securities [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2012
Derivative Securities [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2013
Derivative Securities [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2012
Derivative Securities [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2013
Derivative Securities [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2012
Derivative Securities [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2013
Derivative Securities [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2012
Derivative Securities [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Member]
Foreign Currency Exchange Contracts [Member]
|
Sep. 30, 2013
Designated as Hedging Instrument [Member]
|
Dec. 31, 2012
Designated as Hedging Instrument [Member]
|
Sep. 30, 2013
Euro [Member]
|
Sep. 30, 2013
Euro [Member]
Minimum [Member]
|
Sep. 30, 2013
Euro [Member]
Maximum [Member]
|
Sep. 30, 2013
Australian Dollar [Member]
|
Sep. 30, 2013
Australian Dollar [Member]
Minimum [Member]
|
Sep. 30, 2013
Australian Dollar [Member]
Maximum [Member]
|
Sep. 30, 2013
British Pound [Member]
|
Sep. 30, 2013
British Pound [Member]
Minimum [Member]
|
Sep. 30, 2013
British Pound [Member]
Maximum [Member]
|
Sep. 30, 2013
Canadian Dollar [Member]
|
Sep. 30, 2013
Canadian Dollar [Member]
Minimum [Member]
|
Sep. 30, 2013
Canadian Dollar [Member]
Maximum [Member]
|
|
| Derivative [Line Items] | ||||||||||||||||||||||||||
| Notional amount of foreign currency forward contracts | $ 1,200 | $ 2,950 | $ 600 | $ 550 | ||||||||||||||||||||||
| Derivative maturity date range | Jan. 31, 2014 | Mar. 31, 2014 | Jan. 31, 2014 | Jul. 31, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | ||||||||||||||||||
| Derivatives, Fair Value [Line Items] | ||||||||||||||||||||||||||
| Forward contracts, assets | 116 | 952 | ||||||||||||||||||||||||
| Forward contracts, liabilities | 206 | 115 | ||||||||||||||||||||||||
| Total net forward contracts | 90 | 837 | ||||||||||||||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||||||||||||||||
| Balance, beginning of period | 364 | (267) | (413) | 544 | (1,153) | |||||||||||||||||||||
| Other Comprehensive Income Loss Before Reclassifications Before Tax | 253 | 233 | (483) | 366 | ||||||||||||||||||||||
| Net Revenue Non Directly Delivered Programs | 15,071 | 16,746 | 36,254 | 44,589 | (67) | 679 | (185) | 1,613 | ||||||||||||||||||
| Reclassification into foreign currency and other expenses | 1 | (2) | 22 | (5) | 0 | 0 | 0 | 0 | ||||||||||||||||||
| Effect of incomes taxes | 112 | 363 | (324) | 762 | 23 | (238) | 65 | (565) | ||||||||||||||||||
| Other comprehensive income (loss), net of income taxes | 209 | 674 | (603) | 1,414 | ||||||||||||||||||||||
| Balance, end of period | $ (403) | $ (403) | $ (58) | $ 261 | $ (58) | $ 261 | ||||||||||||||||||||