Recently Issued Accounting Pronouncements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flow comparison
Cash and cash equivalents at beginning of period	$ 63,425
Cash and cash equivalents at end of period	105,833
Cash, cash equivalents, and restricted cash at beginning of period	75,091	$ 79,756
Net decrease in cash in cash, cash equivalents, and restricted cash	45,850	1,738
Cash, cash equivalents, and restricted cash at end of period	$ 120,941	81,494
Previously Reported
Cash Flow comparison
Cash and cash equivalents at beginning of period		59,566
Net decrease in cash and cash equivalents		4,365
Cash and cash equivalents at end of period		$ 63,931