Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Feb. 26, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets
Goodwill	$ 196,218		$ 217,976	$ 211,878
Simmons & Company International
Assets
Cash and cash equivalents		$ 47,201
Fixed assets		1,868
Goodwill		60,737
Intangible assets		26,638
Investments		980
Other assets		5,071
Total assets acquired		142,495
Liabilities
Accrued compensation		15,387
Other liabilities and accrued expenses		7,814
Total liabilities assumed		23,201
Net assets acquired		$ 119,294