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Description of the business and summary of significant accounting policies: Basic and diluted net (loss) income per common share (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Diluted weighted average shares                      
Weighted-average common shares - basic (in shares) 44,323,131 44,474,724 44,774,831 45,158,250 44,577,826 44,574,583 44,491,899 44,402,640 44,641,805 44,888,723 45,960,720
Weighted average common shares-diluted 44,558,089 44,702,127 45,054,507 45,158,250 44,803,782 44,776,918 44,705,037 44,571,937 44,873,030 45,159,489 46,349,670
Recent Accounting Pronouncements                      
Stockholder's equity                 $ 6,160    
ASU 2016-09                      
Recent Accounting Pronouncements                      
Deferred tax assets $ 6,200               6,200    
Stockholder's equity                 $ 6,200    
Restricted stock                      
Diluted weighted average shares                      
Dilutive effect of awards (in shares)                 199,465 230,570 329,754
Stock options                      
Diluted weighted average shares                      
Dilutive effect of awards (in shares)                 31,760 40,196 59,196
Common stock                      
Diluted weighted average shares                      
Anti-dilutive shares                 90,959 119,872 84,690
Restricted common stock                      
Diluted weighted average shares                      
Unvested shares of restricted common stock 908,761       870,751       908,761 870,751 1,282,646
Anti-dilutive shares                 79,450 362,241 379,639