Acquisitions Acquistions (Purchase Price Allocation) (Details) - USD ($) $ in Thousands |
Nov. 30, 2016 |
Jun. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|---|
| Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] | |||
| Goodwill | $ 275,487 | $ 275,487 | |
| Goodwill Recorded | $ 275,487 | $ 275,487 | |
| Houston [Member] | |||
| Business Combination, Consideration Transferred [Abstract] | |||
| Deferred payments | $ 2,000 |