Related-Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transactions
Revenue from related party		$ 142,200	$ 227,500
Expenses from business transactions with unconsolidated affiliates	$ 100
Accounts receivable from affiliated entities	100	24,100
Accounts payable to affiliated entities	100
Long-term payables with affiliated entities	800	800
James R Crane | Crane Capital Group Inc
Related Party Transactions
Accounts payable to affiliated entities	1,000	1,100
Amount paid to related party for services provided	23,500	33,700	$ 89,100
Management
Related Party Transactions
Premium payments to date related to life insurance policies	6,600
Cash surrender value included in other long-term assets	$ 6,000	$ 6,000