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Derivative Financial Instruments (Details) (USD $)
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6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Net Revenue, Non Directly Delivered Programs [Member]
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Jun. 30, 2012
Net Revenue, Non Directly Delivered Programs [Member]
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Jun. 30, 2013
Net Revenue, Non Directly Delivered Programs [Member]
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Jun. 30, 2012
Net Revenue, Non Directly Delivered Programs [Member]
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Jun. 30, 2013
Designated as Hedging Instrument [Member]
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Dec. 31, 2012
Designated as Hedging Instrument [Member]
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Jun. 30, 2013
Euro [Member]
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Jun. 30, 2013
Euro [Member]
Minimum [Member]
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Jun. 30, 2013
Euro [Member]
Maximum [Member]
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Jun. 30, 2013
Australian Dollar [Member]
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Jun. 30, 2013
Australian Dollar [Member]
Minimum [Member]
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Jun. 30, 2013
Australian Dollar [Member]
Maximum [Member]
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Jun. 30, 2013
British Pound [Member]
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Jun. 30, 2013
British Pound [Member]
Minimum [Member]
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Jun. 30, 2013
British Pound [Member]
Maximum [Member]
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Jun. 30, 2013
Canadian Dollar [Member]
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Jun. 30, 2013
Canadian Dollar [Member]
Minimum [Member]
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Jun. 30, 2013
Canadian Dollar [Member]
Maximum [Member]
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Jun. 30, 2013
New Zealand Dollar [Member]
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| Derivative [Line Items] | |||||||||||||||||||||
| Notional amount of foreign currency forward contracts | $ 4,300,000 | $ 4,210,000 | $ 1,120,000 | $ 810,000 | $ 40,000 | ||||||||||||||||
| Derivative maturity date range | Jul. 31, 2013 | Mar. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 | Jul. 31, 2013 | Jun. 30, 2014 | Aug. 31, 2013 | Jun. 30, 2014 | Jul. 31, 2013 | ||||||||||||
| Derivatives, Fair Value [Line Items] | |||||||||||||||||||||
| Forward contracts, assets | 36,000 | 952,000 | |||||||||||||||||||
| Forward contracts, liabilities | 447,000 | 115,000 | |||||||||||||||||||
| Total net forward contracts | 411,000 | 837,000 | |||||||||||||||||||
| Unrealized Gains and Losses Included in AOCI [Abstract] | |||||||||||||||||||||
| Beginning Balance | 544,000 | (1,153,000) | |||||||||||||||||||
| Other comprehensive income (loss), net of income taxes | (811,000) | 740,000 | |||||||||||||||||||
| Ending Balance | (267,000) | (413,000) | |||||||||||||||||||
| Derivative Instruments, Gain (Loss) [Line Items] | |||||||||||||||||||||
| Gain (loss) reclassed from AOCI (effective portion) | 76,000 | (607,000) | 76,000 | (607,000) | |||||||||||||||||
| Forward contracts expected to be reclassified in net revenue during next 12 months | $ 400,000 | ||||||||||||||||||||