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Revenue from Contracts with Customers (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Deferred revenue recognized in period related to beginning balance |  |  | $ 233,100 |
Costs amortized during the period | $ 13,600 |  | (25,496) |
Test Preparation [Member] | Long-term Contract with Customer [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 5,800 |  | $ 5,800 |
Revenue Remaining Performance Obligation Percentage of Revenue Expected to be Recognized Over Next 12 Months | 75.00% |  | 75.00% |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period | 12 months |  | 12 months |
Minimum Term of Contract |  |  | 12 months |
Transferred over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Revenue | 76.00% | 80.00% | 76.00% | 80.00%
Transferred at Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Revenue | 24.00% | 20.00% | 24.00% | 20.00%
U.S. [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Revenue | 76.00% | 75.00% | 76.00% | 75.00%
Non-US [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Revenue | 24.00% | 25.00% | 24.00% | 25.00%

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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