Assets Held for Sale (Assets and Liabilities Held for Sale) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Current assets held for sale:
Cash and equivalents	$ 42
Accounts receivable	5,726
Other current assets	571
Current assets held for sale	6,339
Long-term assets held for sale:
Property and equipment	33,624
Goodwill	244
Other assets	121
Long-term assets held for sale	33,989
Current liabilities held for sale:
Accounts payable	1,320
Accrued liabilities	1,811
Deferred revenue	252
Current liabilities held for sale	3,383
Gain or loss recognized on assets held for sale	$ 14,902