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Merger Transaction - Narrative (Details) $ / shares in Units, $ in Thousands				6 Months Ended
	Dec. 22, 2016 USD ($) installment $ / shares shares	Dec. 21, 2016 USD ($) $ / shares	Dec. 16, 2016 USD ($) shares	Jun. 30, 2017 USD ($) $ / shares	May 24, 2017 $ / shares	Dec. 31, 2016 USD ($) $ / shares	Jun. 02, 2015 $ / shares	Jun. 30, 2014 $ / shares
Business Acquisition [Line Items]
Common stock, par value (usd per share) | $ / shares				$ 0.01	$ 0.01	$ 0.01	$ 0.01
Related party notes receivable acquired in Merger (Note 3) | $				$ 1,285		$ 5,138
The Letter Agreement
Business Acquisition [Line Items]
Related party notes receivable acquired in Merger (Note 3) | $	$ 5,100		$ 6,300	1,300
Percent over gross proceeds to trigger reimbursement			2.00%
Period of equal cash installments			8 months
Period for valuing class b units			30 days
Number of equal cash installments (installment) | installment	8
Proceeds from related party receivable | $				$ 3,900
Class B Units | The Letter Agreement
Business Acquisition [Line Items]
Tender offer (shares) | shares			22,115
Common Stock
Business Acquisition [Line Items]
Share price (usd per share) | $ / shares								$ 30
Merger Agreement
Business Acquisition [Line Items]
Equity consideration (shares) | shares	9,600,000
Merger Consideration owed to Global II | $	$ 220,868	$ 220,900
Merger Agreement | Common Stock
Business Acquisition [Line Items]
Conversion ratio	2.27
Share price (usd per share) | $ / shares		$ 23.1
Merger Agreement | Common Stock | Class B Units
Business Acquisition [Line Items]
Conversion ratio	2.27
Merger Agreement | Global Trust II
Business Acquisition [Line Items]
Common stock, par value (usd per share) | $ / shares	$ 0.01

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