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Concentrations of Credit Risk (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Concentration Risk [Line Items] |  |
Foreign exchange fluctuations loss | $ 0.1 | $ 0.2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Diplomat Specialty Pharmacy [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 21.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Caremark L.L.C. [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 18.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Affiliates of McKesson Corporation [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 16.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Accredo Health, Incorporated [Member] |  |
Concentration Risk [Line Items] |  |
Concentration risk (as a percentage) | 12.00% |

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