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Segment Information (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
segment
ft
Mar. 31, 2016
USD ($)
Segment Reporting Information [Line Items]    
Number of reportable segments | segment 4  
Investigation-related matters $ 1,039 $ 1,890
Employee stock purchase plan expense   $ 100
Maximum | Tubular Sales    
Segment Reporting Information [Line Items]    
Length of tubulars used as caissons or pilings (in feet) (up to) | ft 300