Supplemental Cash Flow Data (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Supplemental Cash Flow Data [Abstract] | |||
| Income taxes paid, net of refunds | $ (906) | $ 11,613 | $ 8,759 |
| Investments in property and equipment not paid | 1,203 | ||
| Receivable for asset sales proceeds | 1,000 | ||
| Dividends payable at year end | $ 1,763 | 50,148 | |
| Receivable for investment sales proceeds | 3,280 | ||
| Impairment of equity method investment | 1,871 | ||
| Noncash contributions by noncontrolling interests | $ 1,210 | $ 183 | |