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Revenue from Contracts with Customers - Change in Contract Assets and Liabilities (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Contract assets increase (decrease)  
Contract assets recognized $ 2,100
Reclassification of contract assets to contra revenue (241)
Impact of business combination 0
Net change 1,859
Contract liabilities (increase) decrease  
Contract liabilities recognized and recorded to contra revenue as a result of performance obligations satisfied (60,847)
Contract liabilities paid 68,635
Cash received in advance and not recognized as revenue (35,514)
Reclassification of cash received in advance to revenue as a result of performance obligations satisfied 40,239
Impact of business combination 640
Net change $ 13,153