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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Business Combination, Contingent Consideration, Liability for Payments to Option Holder, Current | $ 900 | $ 800 |  |
Available-for-sale Securities, Current | 500 | 500 |  |
Assets |  |  |  |
Restricted cash | 24,951 | 23,785 | $ 25,794 | $ 24,175
Investment available for sale | 15,900 | 15,300 |  |
Liabilities |  |  |  |
Fair Value, Discount Amount, Available for sales securities | 2,800 | 2,800 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 247,681 | 249,417 |  |
Restricted cash | 24,951 | 23,785 |  |
Investment available for sale | 16,452 | 15,772 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | 2,280 | 2,407 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 247,681 | 249,417 |  |
Investment available for sale | 0 | 0 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | 0 | 0 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investment available for sale | 0 | 0 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | 0 | 0 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Investment available for sale | 16,452 | 15,772 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 2,280 | $ 2,407 |  |

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