Accounting Policies and Standards Update (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
ASSETS
Other assets (noncurrent)	$ 0	$ 17,998
Liabilities
Accrued expenses	14,610	26,279	$ 26,385
Other liabilities (current)	1,424	937
Other liabilities (noncurrent)	181	6,439	5,731
Equity
Retained earnings	$ (1,029,975)	(370,549)	$ (370,795)
ASC 842 | Scenario Previously Reported [Member]
ASSETS
Other assets (noncurrent)		16,213
Liabilities
Accrued expenses		26,385
Other liabilities (current)		0
Other liabilities (noncurrent)		5,731
Equity
Retained earnings		(370,795)
ASC 842 | Adjustments due to ASC 842
ASSETS
Other assets (noncurrent)		1,785
Liabilities
Accrued expenses		(106)
Other liabilities (current)		937
Other liabilities (noncurrent)		708
Equity
Retained earnings		$ 246