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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2017

^[1]

Dec. 31, 2016

^[1]

Dec. 31, 2015

^[1]

Selected Quarterly Financial Information [Abstract]

Revenue

$ 83,118

$ 31,466

$ 34,566

$ 41,556

$ 77,415

$ 28,642

$ 35,856

$ 51,411

$ 190,706

$ 193,324

$ 203,347

Income (loss) from operations

20,802

(15,673)

(10,468)

(4,113)

16,741

(10,078)

(6,989)

3,149

(9,452)

2,823

10,386

Net income

$ 28,028

$ (2,176)

$ (1,506)

$ 1,080

$ (3,844)

$ 3,448

$ 1,495

$ (795)

$ 25,426

^[2],[3]

$ 304

^[2],[3]

$ 3,964

^[2],[3]

Basic (in usd per share)

$ 1.50

$ (0.12)

$ (0.08)

$ 0.06

$ (0.21)

$ 0.19

$ 0.08

$ (0.04)

$ 1.37

$ 0.02

$ 0.22

Diluted (in usd per share)

$ 1.47

$ (0.12)

$ (0.08)

$ 0.06

$ (0.21)

$ 0.19

$ 0.08

$ (0.04)

$ 1.33

$ 0.02

$ 0.22

[1]	As adjusted for the adoption of ASC 606 using the full retrospective method
[2]	As adjusted for the adoption of ASC 606 using the full retrospective method
[3]	As adjusted for the adoption of ASC 606 using the full retrospective method

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 55
-Paragraph 52
-URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
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-Paragraph 1
-Subparagraph (SX 210.7-04(19))
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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