Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details)

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Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]      
Cash paid for interest, net of interest capitalized of $7,256 in 2015, $8,526 in 2014 and $10,058 in 2013 $ 92,622 $ 77,607 $ 73,909
Cash paid for income taxes 390   3,000
Cash refunds received for income taxes $ 90 3,000 59,126
Cash paid for share-based compensation [1]   $ 431 $ 466
[1] The cash paid for share-based compensation is for dividends on unvested restricted stock and for dividend equivalents paid on RSUs. No cash was received from employees or directors related to share-based compensation and no cash was used to settle any equity instruments granted under share-based compensation arrangements.