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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Vested and Unvested Restricted Stock Units Outstanding
The following table summarizes information about vested and unvested restricted stock units as of the dates indicated:
 
 Six Months Ended June 30,
 20202019
 Restricted Stock
Units
Outstanding		Weighted
Average Grant
Date
Fair Value		Restricted Stock
Units
Outstanding		Weighted
Average Grant
Date
Fair Value
Balance at beginning of period826,263  $23.76  1,140,215  $21.96  
Grants132,605  33.92  165,761  34.03  
Released and distributed (vested)(132,203) 32.52  (195,755) 25.62  
Forfeited/expired(14,826) 34.24  (9,581) 24.72  
Balance at end of period811,839  $24.84  1,100,640  $25.53