XML 39 R28.htm IDEA: XBRL DOCUMENT v3.10.0.1
Recent Accounting Standards (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Recent Accounting Standards [Abstract]        
Restricted Cash $ 28,536      
Cash, cash equivalents and restricted cash at end of period 203,673 [1] $ 255,218 $ 214,170 $ 116,370
Increase in net cash provided by operating activities $ 46      
[1] Balances were adjusted due to the adoption of Financial Accounting Standards Board Accounting Standards Update No. 2016-18, "Statement of Cash Flows (Topic 230): Restricted Cash" as discussed in further detail in Note 2. "Recent Accounting Standards."