CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Par value (in usd per share)	$ 1.00	$ 1.00
Shares authorized (in shares)	1,000,000	1,000,000
Shares outstanding (in shares)	0	0
Par value (in usd per share)	$ 0.01	$ 0.01
Shares authorized (in shares)	49,000,000	49,000,000
Shares issued (in shares)	35,865,433	34,973,987
Nonvested restricted stock (in shares)	1,730,069	1,095,238
Treasury stock, at cost	15,036,154	14,460,024