Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	March 31, 2019		December 31, 2018
	(In thousands)
Cash and cash equivalents	$	153,694	$	198,850
Restricted cash(1):
Included in Other current assets	4,964		7,007
Included in Deferred charges and other assets	1,736		1,727
Total restricted cash	6,700		8,734
Total cash, cash equivalents, and restricted cash	$	160,394	$	207,584