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Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Adoption of ASU 2017-07 (Details)

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Summary of Significant Accounting Policies - Adoption of ASU 2017-07 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] Ìý Ìý Ìý Ìý
Operating income $ 65,505 $ 30,379 $ 119,986 $ 59,269
Other income Ìý 6 Ìý 13
As reported in prior year Ìý Ìý Ìý Ìý
New Accounting Pronouncements or Change in Accounting Principle [Line Items] Ìý Ìý Ìý Ìý
Operating income Ìý 24,732 Ìý 46,836
Other income Ìý 10 Ìý 19
Retrospective Adjustment | Accounting Standards Update 2017-07 Ìý Ìý Ìý Ìý
New Accounting Pronouncements or Change in Accounting Principle [Line Items] Ìý Ìý Ìý Ìý
Operating income Ìý 5,647 Ìý 12,433
Other income Ìý $ (4) Ìý $ (6)