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Goodwill and Other Intangible Assets (Schedule of Intangible Assets and Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Other intangible assets |  |  |
Gross amount | $ 148,395 | $ 148,395 |
Accumulated impairment losses and amortization | (82,937) | (65,495) |
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, Net, Beginning of Period | 82,900 |  |
Other intangible assets, Net, End of Period | 65,458 | 82,900 |
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, Net, Beginning of Period | 265,154 |  |
Goodwill and Other intangible assets, Net, End of Period | 251,186 | 265,154 |
Excluding Equity Method Investments |  |  |
Goodwill |  |  |
Goodwill, Gross amount | 199,889 | 199,889 | $ 8,160
Accumulated impairment losses and amortization | (2,299) | (2,299) | (2,299)
Goodwill [Roll Forward] |  |  |
Goodwill, Net, Beginning of Period | 197,590 | 5,861 |
Acquired during the year |  | 191,729 |
Goodwill, Net, End of Period | 197,590 | 197,590 |
Other intangible assets |  |  |
Gross amount | 96,599 | 96,599 | 12,999
Accumulated impairment losses and amortization | (43,003) | (29,035) | (10,958)
Intangible Assets, Net, Excluding Goodwill [Roll Forward] |  |  |
Other intangible assets, Net, Beginning of Period | 67,564 | 2,041 |
Acquired during the year |  | 83,600 |
Amortization | (13,968) | (18,077) |
Other intangible assets, Net, End of Period | 53,596 | 67,564 |
Goodwill and Other intangible assets, Total |  |  |
Gross amount, Beginning of Period | 296,488 | 296,488 | 21,159
Accumulated impairment losses and amortization, Beginning of Period | (45,302) | (31,334) | $ (13,257)
Intangible Assets, Net, Including Goodwill [Roll Forward] |  |  |
Goodwill and Other intangible assets, Net, Beginning of Period | 265,154 | 7,902 |
Acquired during the year |  | 275,329 |
Amortization | (13,968) | (18,077) |
Goodwill and Other intangible assets, Net, End of Period | $ 251,186 | $ 265,154 |

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