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Stock Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Stock-Based Compensation (Details) [Line Items]      
Stock-based compensation expense $ 9,209 $ 9,541 $ 6,559
Stock-based compensation expense, tax benefit 658 1,715 2,117
Stock-based compensation expense, net of tax $ 8,551 $ 7,826 4,442
Stock Option Activity (Table Details) [Abstract]      
Number of awards outstanding 3,072,181 2,874,366  
Granted 1,029,201    
Forfeited (454,028)    
Expired (377,358)    
Exercisable 1,407,116    
Weighted Average Exercise Price [Abstract]      
Equity awards outstanding $ 25.07 $ 30.33  
Granted 11.80    
Forfeited 24.01    
Expired 30.22    
Exercisable $ 30.53    
Weighted Average Remaining Contractual Life [Abstract]      
Equity awards outstanding 6 years 9 months 22 days    
Exercisable 4 years 11 months 13 days    
Aggregate Intrinsic Value [Abstract]      
Equity awards outstanding $ 0    
Exercisable 0    
Exercised   $ 500 1,900
Excess tax benefits related to stock awards $ 0 $ 86 $ 331
Assumptions Used in Fair Value Calculation of Stock Options (Table Details) [Abstract]      
Weighted average grant date fair value $ 3.06 $ 6.34 $ 6.49
Weighted average risk free interest rate 1.31% 1.42% 1.54%
Weighted average expected dividend yield 3.16% 3.32% 3.28%
Weighted average expected volatility 39.64% 33.28% 34.77%
Weighted average expected life 4 years 7 months 17 days 5 years 18 days 5 years
Restricted Stock Unit Activity (Table Details) [Abstract]      
Number of nonvested restricted stock units outstanding 1,362,131 867,755  
Granted 1,065,190    
Vested (249,638)    
Forfeited (321,176)    
Weighted average grant date fair value, outstanding $ 15.31 $ 26.67  
Weighted average grant date fair value, granted 9.20    
Weighted average grant date fair value, vested 23.34    
Weighted average grant date fair value, forfeited $ 19.50    
2016 Plan [Member]      
Stock-Based Compensation (Details) [Line Items]      
Number of shares authorized to issue 6,500,000    
Stock Option Activity (Table Details) [Abstract]      
Number of awards outstanding 302,935    
2006 Plan [Member]      
Stock-Based Compensation (Details) [Line Items]      
Number of shares authorized to issue 7,000,000    
Stock Option Activity (Table Details) [Abstract]      
Number of awards outstanding 2,108,068 1,762,142  
Equity Incentive Plan [Member]      
Stock-Based Compensation (Details) [Line Items]      
Number of shares authorized to issue 2,468,461    
Stock Option Activity (Table Details) [Abstract]      
Number of awards outstanding 1,526,203 1,587,693  
Prior Plan [Member]      
Stock-Based Compensation (Details) [Line Items]      
Number of shares authorized to issue 14,562,865    
Stock Option Activity (Table Details) [Abstract]      
Number of awards outstanding 650 21,175  
Minimum [Member]      
Stock-Based Compensation (Details) [Line Items]      
Vesting % of performance based restricted stock units, maximum 0.00%    
Maximum [Member]      
Stock-Based Compensation (Details) [Line Items]      
Vesting % of performance based restricted stock units, maximum 200.00%    
Employee Stock Option [Member]      
Stock-Based Compensation (Details) [Line Items]      
Exercise period of options once vested 10 years    
Stock-based compensation expense $ 2,954 $ 4,030 $ 5,044
Weighted average number of years to vesting 2 years 5 months 13 days    
Unvested awards - to result in compensation expense $ 4,900    
Employee Stock Option [Member] | Minimum [Member]      
Stock-Based Compensation (Details) [Line Items]      
Vesting period of options granted 1 year    
Employee Stock Option [Member] | Maximum [Member]      
Stock-Based Compensation (Details) [Line Items]      
Vesting period of options granted 4 years    
Restricted Stock Units (RSUs) [Member]      
Stock-Based Compensation (Details) [Line Items]      
Stock-based compensation expense $ 6,255 $ 5,511 $ 1,515
Weighted average number of years to vesting 1 year 8 months 20 days    
Unvested awards - to result in compensation expense $ 7,800    
Restricted Stock Units (RSUs) [Member] | 2006 Plan [Member]      
Stock-Based Compensation (Details) [Line Items]      
Number of shares authorized to issue 3,500,000