Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details)

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Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total gains (losses) $ 0 $ 0  
Nonrecurring basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total gains (losses) 0   $ (6,305)
Total gains (losses) 0   (1,177)
Balance | Nonrecurring basis      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net 0   8,700
Goodwill 0   9,425
Estimated fair value measurements | Nonrecurring basis | Quoted prices in active market (Level 1)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net 0   0
Goodwill 0   0
Estimated fair value measurements | Nonrecurring basis | Significant other observable inputs (Level 2)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net 0   8,700
Goodwill 0   0
Estimated fair value measurements | Nonrecurring basis | Significant other unobservable inputs (Level 3)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Property and equipment, net 0   0
Goodwill $ 0   $ 9,425