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Revenue from Contracts with Customers (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Contract with Customer, Liability, Revenue Recognized $ 10,700,000  
Revenue, Remaining Performance Obligation 32,700,000.0  
Contract with Customer, Liability, Current $ 16,985,000 $ 20,737,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 2 years  
Minimum [Member]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate 3.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year  
Maximum [Member]    
Long-Duration Contracts, Assumptions by Product and Guarantee, Discount Rate 6.00%  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 3 years