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Equity - Common Stock Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 03, 2017 | Sep. 08, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Dividends, Common Stock, Cash |  |  |  | $ 15,257 | $ 10,885 | $ 7,000 |  |
Common Stock, Dividends, Per Share, Cash Paid | $ 0.36 | $ 0.26 | $ 0.16 |  |  |  |  |
Common Class C, Non-Voting [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  | $ 5,400 | $ 25,000
Repurchase of Class C Common Stock |  |  |  | 668,000 |  |  |  |
Stock Repurchased and Retired During Period, Value | $ 19,600 |  |  | $ 19,600 |  |  |  |

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