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Fair Value Measurements (Balance Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
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 | 33,596 | 24,175 | $ 26,705 | $ 16,488
Investment available for sale | 15,300 | 17,300 |  |
Liabilities |  |  |  |
Fair Value, Discount Amount, Available for sales securities | 2,800 | 2,900 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 440,963 | 203,104 |  |
Restricted cash | 33,596 | 24,175 |  |
Investment available for sale | 15,817 | 17,752 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | 2,557 | 2,887 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 440,963 | 203,104 |  |
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 | 15,817 | 17,752 |  |
Liabilities |  |  |  |
Business Combination, Contingent Consideration, Liability | $ 2,557 | $ 2,887 |  |

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