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Long-Term Debt Long-Term Debt (Narrative) (Details)
$ in Thousands
 12 Months Ended
May. 20, 2015
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Line of credit facility, current borrowing capacity   $ 325,000
Principal amount   $ 208,466
Ratio of indebtedness to net capital (in ratio)   2.97
Debt compliance, required minimum fixed charge ratio   1.20
Ratio of earnings to fixed cost obligations (in ratio)   2.79
Before June 29, 2014    
Debt Instrument [Line Items]    
Debt compliance, required maximum leverage ratio   3.25
After June 29, 2013    
Debt Instrument [Line Items]    
Debt compliance, required maximum leverage ratio   3.50
Line of Credit | Prime Rate Option    
Debt Instrument [Line Items]    
Debt instrument interest rate (in percent)   1.50%
Line of Credit | LIBOR Margin Option    
Debt Instrument [Line Items]    
Debt instrument interest rate (in percent)   2.50%
Deferred Purchase Price Notes    
Debt Instrument [Line Items]    
Debt instrument interest rate (in percent)   0.00%
Deferred Purchase Price Notes | Minimum    
Debt Instrument [Line Items]    
Debt instrument interest rate (in percent)   7.00%
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)   8.50%
Debt instrument, term   5 years
Deferred Purchase Price Notes | Maximum    
Debt Instrument [Line Items]    
Debt instrument interest rate (in percent)   11.00%
Deferred purchase price notes payable to sellers of acquired entities, discounted imputed interest rate (in Percent)   10.00%
Debt instrument, term   20 years
Revolving Credit Facility    
Debt Instrument [Line Items]    
Line of credit facility, current borrowing capacity   $ 200,000
Line of credit facility, potential increase to borrowing capacity   50,000
Revolving Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Minimum unrestricted cash and undrawn borrowing capacity $ 15,000  
Maximum senior secured leverage ratio 3.25  
Credit Facility, Term Note    
Debt Instrument [Line Items]    
Line of credit facility, current borrowing capacity   $ 125,000
Line of credit facility, weighted average interest rate   2.60%