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Business Segments (Reconciliation of Segment Results to Consolidated Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Segments [Abstract]        
Income (loss) from construction operations $ 47,306 $ 49,072 $ 101,196 $ 120,134
Other income, net 1,909 967 3,739 42,373
Interest expense (16,411) (15,643) (47,474) (53,726)
INCOME BEFORE INCOME TAXES $ 32,804 $ 34,396 $ 57,461 $ 108,781