Significant Accounting Policies and Recent Accounting Pronouncements - ASU 2014-09 Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets of discontinued operations	$ 155	$ 7,051	$ 115,206	$ 104,024
Current liabilities of discontinued operations	1,430	3,257	67,085	61,643
Noncurrent liabilities of discontinued operations			7,595	7,565
Retained earnings, net of tax	317,592	310,998		336,017	$ 297,675
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets of discontinued operations				11,182
Current liabilities of discontinued operations				5,442
Noncurrent liabilities of discontinued operations				30
Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings, net of tax	$ 183,733	$ 187,127	$ 210,528	204,818	$ 156,718
Retained Earnings (Accumulated Deficit) | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings, net of tax				$ 5,710