Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Disposal Group, Including Discontinued Operation, Assets, Current						$ 58,800
Disposal Group, Including Discontinued Operation, Liabilities, Current						$ 3,200
Cumulative Effect of New Accounting Principle in Period of Adoption					$ (5)
Reclassification due to change in accounting principles			$ 0
Accounting Standards Update 2017-12 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					(5)
Accounting Standards Update 2017-07 [Member]
Prior Period Reclassification Adjustment		$ 181		$ 341
Reclassification due to change in accounting principles	$ 145		$ 280
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 339